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Friday, December 2, 2022

Medieval medicine of Western Europe

"Anatomical Man" (also "Zodiacal Man"), Très Riches Heures du Duc de Berry (Ms.65, f.14v, early 15th century)

Medieval medicine in Western Europe was composed of a mixture of pseudoscientific ideas from antiquity. In the Early Middle Ages, following the fall of the Western Roman Empire, standard medical knowledge was based chiefly upon surviving Greek and Roman texts, preserved in monasteries and elsewhere. Medieval medicine is widely misunderstood, thought of as a uniform attitude composed of placing hopes in the church and God to heal all sicknesses, while sickness itself exists as a product of destiny, sin, and astral influences as physical causes. On the other hand, medieval medicine, especially in the second half of the medieval period (c. 1100–1500 AD), became a formal body of theoretical knowledge and was institutionalized in the universities. Medieval medicine attributed illnesses, and disease, not to sinful behaviour, but to natural causes, and sin was connected to illness only in a more general sense of the view that disease manifested in humanity as a result of its fallen state from God. Medieval medicine also recognized that illnesses spread from person to person, that certain lifestyles may cause ill health, and some people have a greater predisposition towards bad health than others.

Influences

Hippocratic medicine

The Western medical tradition often traces its roots directly to the early Greek civilization, much like the foundation of all of Western society. The Greeks certainly laid the foundation for Western medical practice but much more of Western medicine can be traced to the Middle East, Germanic, and Celtic cultures. The Greek medical foundation comes from a collection of writings known today as the Hippocratic Corpus. Remnants of the Hippocratic Corpus survive in modern medicine in forms like the "Hippocratic Oath" as in to "Do No Harm".

The Hippocratic Corpus, popularly attributed to an ancient Greek medical practitioner known as Hippocrates, lays out the basic approach to health care. Greek philosophers viewed the human body as a system that reflects the workings of nature and Hippocrates applied this belief to medicine. The body, as a reflection of natural forces, contained four elemental properties expressed to the Greeks as the four humors. The humors represented fire, air, earth and water through the properties of hot, cold, dry and moist, respectively. Health in the human body relied on keeping these humors in balance within each person.

Maintaining the balance of humors within a patient occurred in several ways. An initial examination took place as standard for a physician to properly evaluate the patient. The patient's home climate, their normal diet, and astrological charts were regarded during a consultation. The heavens influenced each person in different ways by influencing elements connected to certain humors, important information in reaching a diagnosis. After the examination, the physician could determine which humor was unbalanced in the patient and prescribe a new diet to restore that balance. Diet included not only food to eat or avoid but also an exercise regimen and medication.

Hippocratic medicine was written down within the Hippocratic Corpus, therefore medical practitioners were required to be literate. The written treatises within the Corpus are varied, incorporating medical doctrine from any source the Greeks came into contact with. At Alexandria in Egypt, the Greeks learned the art of surgery and dissection; the Egyptian skill in these arenas far surpassed those of Greeks and Romans due to social taboos regarding treatment of the dead. The early Hippocratic practitioner Herophilus engaged in dissection and added new knowledge to human anatomy in the realms of the human nervous system, the inner workings of the eye, differentiating arteries from veins, and using pulses as a diagnostic tool in treatment. Surgery and dissection yielded much knowledge of the human body that Hippocratic physicians employed alongside their methods of balancing humors in patients. The combination of knowledge in diet, surgery, and medication formed the foundation of medical learning upon which Galen would later build upon with his own works.

Temple healing

The Greeks had been influenced by their Egyptian neighbours, in terms of medical practice in surgery and medication. However, the Greeks also absorbed many folk healing practices, including incantations and dream healing. In Homer's Iliad and Odyssey the gods are implicated as the cause of plagues or widespread disease and that those maladies could be cured by praying to them. The religious side of Greek medical practice is clearly manifested in the cult of Asclepius, whom Homer regarded as a great physician, and was deified in the third and fourth century BC. Hundreds of temples devoted to Asclepius were founded throughout the Greek and Roman empire to which untold numbers of people flocked for cures. Healing visions and dreams formed the foundation for the curing process as the person seeking treatment from Asclepius slept in a special dormitory. The healing occurred either in the person's dream or advice from the dream could be used to seek out the proper treatment for their illness elsewhere. Afterwards the visitor to the temple bathed, offered prayers and sacrifice, and received other forms of treatment like medication, dietary restrictions, and an exercise regiment, keeping with the Hippocratic tradition.

Pagan and folk medicine

Some of the medicine in the Middle Ages had its roots in pagan and folk practices. This influence was highlighted by the interplay between Christian theologians who adopted aspects of pagan and folk practices and chronicled them in their own works. The practices adopted by Christian medical practitioners around the 2nd century, and their attitudes toward pagan and folk traditions, reflected an understanding of these practices, especially humoralism and herbalism.

The practice of medicine in the early Middle Ages was empirical and pragmatic. It focused mainly on curing disease rather than discovering the cause of diseases. Often it was believed the cause of disease was supernatural. Nevertheless, secular approaches to curing diseases existed. People in the Middle Ages understood medicine by adopting the ancient Greek medical theory of humors. Since it was clear that the fertility of the earth depended on the proper balance of the elements, it followed that the same was true for the body, within which the various humors had to be in balance. This approach greatly influenced medical theory throughout the Middle Ages.

Folk medicine of the Middle Ages dealt with the use of herbal remedies for ailments. The practice of keeping physic gardens teeming with various herbs with medicinal properties was influenced by the gardens of Roman antiquity. Many early medieval manuscripts have been noted for containing practical descriptions for the use of herbal remedies. These texts, such as the Pseudo-Apuleius, included illustrations of various plants that would have been easily identifiable and familiar to Europeans at the time. Monasteries later became centres of medical practice in the Middle Ages, and carried on the tradition of maintaining medicinal gardens. These gardens became specialized and capable of maintaining plants from the Southern Hemisphere as well as maintaining plants during winter.

Hildegard of Bingen was an example of a medieval medical practitioner who, while educated in classical Greek medicine, also utilized folk medicine remedies. Her understanding of the plant based medicines informed her commentary on the humors of the body and the remedies she described in her medical text Causae et curae were influenced by her familiarity with folk treatments of disease. In the rural society of Hildegard's time, much of the medical care was provided by women, along with their other domestic duties. Kitchens were stocked with herbs and other substances required in folk remedies for many ailments. Causae et curae illustrated a view of symbiosis of the body and nature, that the understanding of nature could inform medical treatment of the body. However, Hildegard maintained the belief that the root of disease was a compromised relationship between a person and God. Many parallels between pagan and Christian ideas about disease existed during the early Middle Ages. Christian views of disease differed from those held by pagans because of a fundamental difference in belief: Christians' belief in a personal relationship with God greatly influenced their views on medicine.

Evidence of pagan influence on emerging Christian medical practice was provided by many prominent early Christian thinkers, such as Origen, Clement of Alexandria, and Augustine, who studied natural philosophy and held important aspects of secular Greek philosophy that were in line with Christian thought. They believed faith supported by sound philosophy was superior to simple faith. The classical idea of the physician as a selfless servant who had to endure unpleasant tasks and provide necessary, often painful treatment was of great influence on early Christian practitioners. The metaphor was not lost on Christians who viewed Christ as the ultimate physician. Pagan philosophy had previously held that the pursuit of virtue should not be secondary to bodily concerns. Similarly, Christians felt that, while caring for the body was important, it was second to spiritual pursuits. The relationship between faith and the bodies ailments explains why most medieval medical practice was performed by Christian monks.

Monasteries

Monasteries developed not only as spiritual centers, but also centers of intellectual learning and medical practice. Locations of the monasteries were secluded and designed to be self-sufficient, which required the monastic inhabitants to produce their own food and also care for their sick. Prior to the development of hospitals, people from the surrounding towns looked to the monasteries for help with their sick.

A combination of both spiritual and natural healing was used to treat the sick. Herbal remedies, known as Herbals, along with prayer and other religious rituals were used in treatment by the monks and nuns of the monasteries. Herbs were seen by the monks and nuns as one of God’s creations for the natural aid that contributed to the spiritual healing of the sick individual. An herbal textual tradition also developed in the medieval monasteries. Older herbal Latin texts were translated and also expanded in the monasteries. The monks and nuns reorganized older texts so that they could be utilized more efficiently, adding a table of contents for example to help find information quickly. Not only did they reorganize existing texts, but they also added or eliminated information. New herbs that were discovered to be useful or specific herbs that were known in a particular geographic area were added. Herbs that proved to be ineffective were eliminated. Drawings were also added or modified in order for the reader to effectively identify the herb. The Herbals that were being translated and modified in the monasteries were some of the first medical texts produced and used in medical practice in the Middle Ages.

Not only were herbal texts being produced, but also other medieval texts that discussed the importance of the humors. Monasteries in Medieval Europe gained access to Greek medical works by the middle of the 6th century. Monks translated these works into Latin, after which they were gradually disseminated across Europe. Monks such as Arnald of Villanova also translated the works of Galen and other classical Greek scholars from Arabic to Latin during the Medieval ages. By producing these texts and translating them into Latin, Christian monks both preserved classical Greek medical information and allowed for its use by European medical practitioners. By the early 1300s these translated works would become available at medieval universities and form the foundation of the universities medical teaching programs.

Hildegard of Bingen, a well known abbess, wrote about Hippocratic Medicine using humoral theory and how balance and imbalance of the elements affected the health of an individual, along with other known sicknesses of the time, and ways in which to combine both prayer and herbs to help the individual become well. She discusses different symptoms that were common to see and the known remedies for them.

In exchanging the herbal texts among monasteries, monks became aware of herbs that could be very useful but were not found in the surrounding area. The monastic clergy traded with one another or used commercial means to obtain the foreign herbs. Inside most of the monastery grounds there had been a separate garden designated for the plants that were needed for the treatment of the sick. A serving plan of St. Gall depicts a separate garden to be developed for strictly medical herbals. Monks and nuns also devoted a large amount of their time in the cultivation of the herbs they felt were necessary in the care of the sick. Some plants were not native to the local area and needed special care to be kept alive. The monks used a form of science, what we would today consider botany, to cultivate these plants. Foreign herbs and plants determined to be highly valuable were grown in gardens in close proximity to the monastery in order for the monastic clergy to hastily have access to the natural remedies.

Medicine in the monasteries was concentrated on assisting the individual to return to normal health. Being able to identify symptoms and remedies was the primary focus. In some instances identifying the symptoms led the monastic clergy to have to take into consideration the cause of the illness in order to implement a solution. Research and experimental processes were continuously being implemented in monasteries to be able to successfully fulfill their duties to God to take care of all God's people.

Christian charity

Christian practice and attitudes toward medicine drew on Middle Eastern (particularly from local Jews) and Greek influences. The Jews took their duty to care for their fellow Jews seriously. This duty extended to lodging and medical treatment of pilgrims to the temple at Jerusalem. Temporary medical assistance had been provided in classical Greece for visitors to festivals and the tradition extended through the Roman Empire, especially after Christianity became the state religion prior to the empire's decline. In the early Medieval period, hospitals, poor houses, hostels, and orphanages began to spread from the Middle East, each with the intention of helping those most in need.

Charity, the driving principle behind these healing centers, encouraged the early Christians to care for others. The cities of Jerusalem, Constantinople, and Antioch contained some of the earliest and most complex hospitals, with many beds to house patients and staff physicians with emerging specialties. Some hospitals were large enough to provide education in medicine, surgery and patient care. St. Basil (AD 330–79) argued that God put medicines on the Earth for human use, while many early church fathers agreed that Hippocratic medicine could be used to treat the sick and satisfy the charitable need to help others.

Medicine

Medieval European medicine became more developed during the Renaissance of the 12th century, when many medical texts both on Ancient Greek medicine and on Islamic medicine were translated from Greek and Arabic during the 13th century. The most influential among these texts was Avicenna's The Canon of Medicine, a medical encyclopedia written in circa 1030 which summarized the medicine of Greek, Indian and Muslim physicians until that time. The Canon became an authoritative text in European medical education until the early modern period. Other influential texts from Jewish authors include the Liber pantegni by Isaac Israeli ben Solomon, while Arabic authors contributed De Gradibus by Alkindus and Al-Tasrif by Abulcasis.

At Schola Medica Salernitana in Southern Italy, medical texts from Byzantium and the Arab world (see Medicine in medieval Islam) were readily available, translated from the Greek and Arabic at the nearby monastic centre of Monte Cassino. The Salernitan masters gradually established a canon of writings, known as the ars medicinae (art of medicine) or articella (little art), which became the basis of European medical education for several centuries.

During the Crusades the influence of Islamic medicine became stronger. The influence was mutual and Islamic scholars such as Usamah ibn Munqidh also described their positive experience with European medicine – he describes a European doctor successfully treating infected wounds with vinegar and recommends a treatment for scrofula demonstrated to him by an unnamed "Frank".

Classical medicine

Anglo-Saxon translations of classical works like Dioscorides Herbal survive from the 10th century, showing the persistence of elements of classical medical knowledge. Other influential translated medical texts at the time included the Hippocratic Corpus attributed to Hippocrates, and the writings of Galen.

Galen of Pergamon, a Greek, was one of the most influential ancient physicians. Galen described the four classic symptoms of inflammation (redness, pain, heat, and swelling) and added much to the knowledge of infectious disease and pharmacology. His anatomic knowledge of humans was defective because it was based on dissection of animals, mainly apes, sheep, goats and pigs. Some of Galen's teachings held back medical progress. His theory, for example, that the blood carried the pneuma, or life spirit, which gave it its red colour, coupled with the erroneous notion that the blood passed through a porous wall between the ventricles of the heart, delayed the understanding of circulation and did much to discourage research in physiology. His most important work, however, was in the field of the form and function of muscles and the function of the areas of the spinal cord. He also excelled in diagnosis and prognosis.

Medieval surgery

Medieval surgery arose from a foundation created from ancient Egyptian, Greek and Arabic medicine. An example of such influence would be Galen, the most influential practitioner of surgical or anatomical practices that he performed while attending to gladiators at Pergamon. The accomplishments and the advancements in medicine made by the Arabic world were translated and made available to the Latin world. This new wealth of knowledge allowed for a greater interest in surgery.

In Paris, in the late thirteenth century, it was deemed that surgical practices were extremely disorganized, and so the Parisian provost decided to enlist six of the most trustworthy and experienced surgeons and have them assess the performance of other surgeons. The emergence of universities allowed for surgery to be a discipline that should be learned and be communicated to others as a uniform practice. The University of Padua was one of the "leading Italian universities in teaching medicine, identification and treating of diseases and ailments, specializing in autopsies and workings of the body." The most prestigious and famous part of the university, the Anatomical Theatre of Padua, is the oldest surviving anatomical theater, in which students studied anatomy by observing their teachers perform public dissections.

Surgery was formally taught in Italy even though it was initially looked down upon as a lower form of medicine. The most important figure of the formal learning of surgery was Guy de Chauliac. He insisted that a proper surgeon should have a specific knowledge of the human body such as anatomy, food and diet of the patient, and other ailments that may have affected the patients. Not only should surgeons have knowledge about the body but they should also be well versed in the liberal arts. In this way, surgery was no longer regarded as a lower practice, but instead began to be respected and gain esteem and status.

During the Crusades, one of the duties of surgeons was to travel around a battlefield, assessing soldiers' wounds and declaring whether or not the soldier was deceased. Because of this task, surgeons were deft at removing arrowheads from their patients' bodies. Another class of surgeons that existed were barber surgeons. They were expected not only to be able to perform formal surgery, but also to be deft at cutting hair and trimming beards. Some of the surgical procedures they would conduct were bloodletting and treating sword and arrow wounds.

In the mid-fourteenth century, there were restrictions placed on London surgeons as to what types of injuries they were able to treat and the types of medications that they could prescribe or use, because surgery was still looked at as an incredibly dangerous procedure that should only be used appropriately. Some of the wounds that were allowed to be performed on were external injuries, such as skin lacerations caused by a sharp edge, such as by a sword, dagger and axe or through household tools such as knives. During this time, it was also expected that the surgeons were extremely knowledgeable on human anatomy and would be held accountable for any consequences as a result of the procedure.

Advances

A dentist with silver forceps and a necklace of large teeth, extracting the tooth of a well seated man. Omne Bonum (England - London; 1360–1375).

The Middle Ages contributed a great deal to medical knowledge. This period contained progress in surgery, medical chemistry, dissection, and practical medicine. The Middle Ages laid the ground work for later, more significant discoveries. There was a slow but constant progression in the way that medicine was studied and practiced. It went from apprenticeships to universities and from oral traditions to documenting texts. The most well-known preservers of texts, not only medical, would be the monasteries. The monks were able to copy and revise any medical texts that they were able to obtain.

Besides documentation the Middle Ages also had one of the first well known female physicians, Hildegard of Bingen. Hildegard was born in 1098 and at the age of fourteen she entered the double monastery of Dissibodenberg. She wrote the medical text Causae et curae, in which many medical practices of the time were demonstrated. This book contained diagnosis, treatment, and prognosis of many different diseases and illnesses. This text sheds light on medieval medical practices of the time. It also demonstrates the vast amount of knowledge and influences that she built upon. In this time period medicine was taken very seriously, as is shown with Hildegard's detailed descriptions on how to perform medical tasks. The descriptions are nothing without their practical counterpart, and Hildegard was thought to have been an infirmarian in the monastery where she lived. An infirmarian treated not only other monks but pilgrims, workers, and the poor men, women, and children in the monastery's hospice. Because monasteries were located in rural areas the infirmarian was also responsible for the care of lacerations, fractures, dislocations, and burns. Along with typical medical practice the text also hints that the youth (such as Hildegard) would have received hands-on training from the previous infirmarian. Beyond routine nursing this also shows that medical remedies from plants, either grown or gathered, had a significant impact of the future of medicine. This was the beginnings of the domestic pharmacy.

Although plants were the main source of medieval remedies, around the sixteenth century medical chemistry became more prominent. "Medical chemistry began with the adaptation of chemical processes to the preparation of medicine". Previously medical chemistry was characterized by any use of inorganic materials, but it was later refined to be more technical, like the processes of distillation. John of Rupescissa's works in alchemy and the beginnings of medical chemistry is recognized for the bounds in chemistry. His works in making the philosopher's stone, also known as the fifth essence, were what made he became known for. Distillation techniques were mostly used, and it was said that by reaching a substance's purest form the person would find the fifth essence, and this is where medicine comes in. Remedies were able to be made more potent because there was now a way to remove nonessential elements. This opened many doors for medieval physicians as new, different remedies were made. Medical chemistry provided an "increasing body of pharmacological literature dealing with the use of medicines derived from mineral sources". Medical chemistry also shows the use of alcohols in medicine. Though these events were not huge bounds for the field, they were influential in determining the course of science. It was the start of differentiation between alchemy and chemistry.

The Middle Ages brought a new way of thinking and a lessening on the taboo of dissection. Dissection for medical purposes became more prominent around 1299. During this time the Italians were practicing anatomical dissection and the first record of an autopsy dates from 1286. Dissection was first introduced in the educational setting at the university of Bologna, to study and teach anatomy. The fourteenth century saw a significant spread of dissection and autopsy in Italy, and was not only taken up by medical faculties, but by colleges for physicians and surgeons.

Roger Frugardi of Parma composed his treatise on Surgery around about 1180. Between 1250 and 1265 Theodoric Borgognoni produced a systematic four volume treatise on surgery, the Cyrurgia, which promoted important innovations as well as early forms of antiseptic practice in the treatment of injury, and surgical anaesthesia using a mixture of opiates and herbs.

Compendiums like Bald's Leechbook (circa 900), include citations from a variety of classical works alongside local folk remedies.

Theories of medicine

Although each of these theories has distinct roots in different cultural and religious traditions, they were all intertwined in the general understanding and practice of medicine. For example, the Benedictine abbess and healer, Hildegard of Bingen, claimed that black bile and other humour imbalances were directly caused by presence of the Devil and by sin. Another example of the fusion of different medicinal theories is the combination of Christian and pre-Christian ideas about elf-shot (elf- or fairy-caused diseases) and their appropriate treatments. The idea that elves caused disease was a pre-Christian belief that developed into the Christian idea of disease-causing demons or devils. Treatments for this and other types of illness reflected the coexistence of Christian and pre-Christian or pagan ideas of medicine.

Humours

13th-century illustration showing the veins.
 

The theory of humours was derived from the ancient medical works and was accepted until the 19th century. The theory stated that within every individual there were four humours, or principal fluids – black bile, yellow bile, phlegm, and blood, these were produced by various organs in the body, and they had to be in balance for a person to remain healthy. Too much phlegm in the body, for example, caused lung problems; and the body tried to cough up the phlegm to restore a balance. The balance of humours in humans could be achieved by diet, medicines, and by blood-letting, using leeches. Leeches were usually starved the day before application to a patient in order to increase their efficiency. The four humours were also associated with the four seasons, black bile-autumn, yellow bile-summer, phlegm-winter and blood-spring.

HUMOUR TEMPER ORGAN NATURE ELEMENT
Black bile Melancholic Spleen Cold Dry Earth
Phlegm Phlegmatic Lungs Cold Wet Water
Blood Sanguine Head Warm Wet Air
Yellow bile Choleric Gall Bladder Warm Dry Fire

The astrological signs of the zodiac were also thought to be associated with certain humours . Even now, some still use words "choleric", "sanguine", "phlegmatic" and "melancholic" to describe personalities.

Herbalism and botany

Herbs were commonly used in salves and drinks to treat a range of maladies. The particular herbs used depended largely on the local culture and often had roots in pre-Christian religion. The success of herbal remedies was often ascribed to their action upon the humours within the body. The use of herbs also drew upon the medieval Christian doctrine of signatures which stated that God had provided some form of alleviation for every ill, and that these things, be they animal, vegetable or mineral, carried a mark or a signature upon them that gave an indication of their usefulness. For example, skullcap seeds (used as a headache remedy) can appear to look like miniature skulls; and the white spotted leaves of lungwort (used for tuberculosis) bear a similarity to the lungs of a diseased patient. A large number of such resemblances were believed to exist.

Many monasteries developed herb gardens for use in the production of herbal cures, and these remained a part of folk medicine, as well as being used by some professional physicians. Books of herbal remedies were produced, one of the most famous being the Welsh, Red Book of Hergest, dating from around 1400.

During the early Middle Ages, botany had undergone drastic changes from that of its antiquity predecessor (Greek practice). An early medieval treatise in the West on plants known as the Ex herbis femininis was largely based on Dioscorides Greek text: De material medica. The Ex herbis was a lot more popular during this time because it was not only easier to read, but contained plants and their remedies that related to the regions of southern Europe, where botany was being studied. It also provided better medical direction on how to create remedies, and how to properly use them. This book was also highly illustrated, where its former was not, making the practice of botany easier to comprehend.

Dioscoridis: De materia medica

The re-emergence of Botany in the medieval world came about during the sixteenth century. As part of the revival of classical medicine, one of the biggest areas of interest was materia medica: the study of remedial substances. “Italian humanists in the fifteenth century had recovered and translated ancient Greek botanical texts which had been unknown in the West in the Middle Ages or relatively ignored”. Soon after the rise in interest in botany, universities such as Padua and Bologna started to create programs and fields of study; some of these practices including setting up gardens so that students were able to collect and examine plants. “Botany was also a field in which printing made a tremendous impact, through the development of naturalistic illustrated herbals”. During this time period, university practices were highly concerned with the philosophical matters of study in sciences and the liberal arts, “but by the sixteenth century both scholastic discussion of plants and reliance upon intermediary compendia for plant names and descriptions were increasingly abandoned in favor of direct study of the original texts of classical authors and efforts to reconcile names, descriptions, and plants in nature”. Botanist expanded their knowledge of different plant remedies, seeds, bulbs, uses of dried and living plants through continuous interchange made possible by printing. In sixteenth century medicine, botany was rapidly becoming a lively and fast-moving discipline that held wide universal appeal in the world of doctors, philosophers, and pharmacists.

Mental disorders

Those with mental disorders in medieval Europe were treated using a variety of different methods, depending on the beliefs of the physician they would go to. Some doctors at the time believed that supernatural forces such as witches, demons or possession caused mental disorders. These physicians believed that prayers and incantations, along with exorcisms, would cure the afflicted and relieve them of their suffering. Another form of treatment existed to help expel evil spirits from the body of a patient, known as trephining. Trephining was a means of treating epilepsy by opening a hole in the skull through drilling or cutting. It was believed that any evil spirit or evil air would flow out of the body through the hole and leave the patient in peace. Contrary to the common belief that most physicians in Medieval Europe believed that mental illness was caused by supernatural factors, it is believed that these were only the minority of cases related to the diagnosis and treatment of those suffering from mental disorders. Most physicians believed that these disorders were caused by physical factors, such as the malfunction of organs or an imbalance of the humors. One of the most well-known and reported examples was the belief that an excess amount of black bile was the cause of melancholia, which would now be classified as schizophrenia or depression. Medieval physicians used various forms of treatment to try to fix any physical problems that were causing mental disorders in their patients. When the cause of the disorder being examined was believed to be caused by an imbalance of the four humors, doctors attempted to rebalance the body. They did so through a combination of emetics, laxatives and different methods of bloodletting, in order to remove excess amounts of bodily fluids.

Christian interpretation

Medicine in the Middle Ages was rooted in Christianity through not only the spread of medical texts through monastic tradition but also through the beliefs of sickness in conjunction with medical treatment and theory. Christianity, throughout the medieval period, did not set medical knowledge back or forwards. The church taught that God sometimes sent illness as a punishment, and that in these cases, repentance could lead to a recovery. This led to the practice of penance and pilgrimage as a means of curing illness. In the Middle Ages, some people did not consider medicine a profession suitable for Christians, as disease was often considered God-sent. God was considered to be the "divine physician" who sent illness or healing depending on his will. From a Christian perspective, disease could be seen either as a punishment from God or as an affliction of demons (or elves, see first paragraph under Theories of Medicine). The ultimate healer in this interpretation is of course God, but medical practitioners cited both the bible and Christian history as evidence that humans could and should attempt to cure diseases. For example, the Lorsch Book of Remedies or the Lorsch Leechbook contains a lengthy defense of medical practice from a Christian perspective. Christian treatments focused on the power of prayer and holy words, as well as liturgical practice.

However, many monastic orders, particularly the Benedictines, were very involved in healing and caring for the sick and dying. In many cases, the Greek philosophy that early Medieval medicine was based upon was compatible with Christianity. Though the widespread Christian tradition of sickness being a divine intervention in reaction to sin was popularly believed throughout the Middle Ages, it did not rule out natural causes. For example, the Black Death was thought to have been caused by both divine and natural origins. The plague was thought to have been a punishment from God for sinning, however because it was believed that God was the reason for all natural phenomena, the physical cause of the plague could be scientifically explained as well. One of the more widely accepted scientific explanations of the plague was the corruption of air in which pollutants such as rotting matter or anything that gave the air an unpleasant scent caused the spread of the plague.

Hildegard of Bingen (1098–1179) played an important role in how illness was interpreted through both God and natural causes through her medical texts as well. As a nun, she believed in the power of God and prayer to heal, however she also recognized that there were natural forms of healing through the humors as well. Though there were cures for illness outside of prayer, ultimately the patient was in the hands of God. One specific example of this comes from her text Causae et Curae in which she explains the practice of bleeding:

Bleeding, says Hildegard, should be done when the moon is waning, because then the "blood is low" (77:23–25). Men should be bled from the age of twelve (120:32) to eighty (121:9), but women, because they have more of the detrimental humors, up to the age of one hundred (121:24). For therapeutic bleeding, use the veins nearest the diseased part (122:19); for preventive bleeding, use the large veins in the arms (121:35–122:11), because they are like great rivers whose tributaries irrigate the body (123:6–9, 17–20). 24 From a strong man, take "the amount that a thirsty person can swallow in one gulp" (119:20); from a weak one, "the amount that an egg of moderate size can hold" (119:22–23). Afterward, let the patient rest for three days and give him undiluted wine (125:30), because "wine is the blood of the earth" (141:26). This blood can be used for prognosis; for instance, "if the blood comes out turbid like a man's breath, and if there are black spots in it, and if there is a waxy layer around it, then the patient will die, unless God restore him to life" (124:20–24).

Monasteries were also important in the development of hospitals throughout the Middle Ages, where the care of sick members of the community was an important obligation. These monastic hospitals were not only for the monks who lived at the monasteries but also the pilgrims, visitors and surrounding population. The monastic tradition of herbals and botany influenced Medieval medicine as well, not only in their actual medicinal uses but in their textual traditions. Texts on herbal medicine were often copied in monasteries by monks, but there is substantial evidence that these monks were also practicing the texts that they were copying. These texts were progressively modified from one copy to the next, with notes and drawings added into the margins as the monks learned new things and experimented with the remedies and plants that the books supplied. Monastic translations of texts continued to influence medicine as many Greek medical works were translated into Arabic. Once these Arabic texts were available, monasteries in western Europe were able to translate them, which in turn would help shape and redirect Western medicine in the later Middle Ages. The ability for these texts to spread from one monastery or school in adjoining regions created a rapid diffusion of medical texts throughout western Europe.

The influence of Christianity continued into the later periods of the Middle Ages as medical training and practice moved out of the monasteries and into cathedral schools, though more for the purpose of general knowledge rather than training professional physicians. The study of medicine was eventually institutionalized into the medieval universities. Even within the university setting, religion dictated a lot of the medical practice being taught. For instance, the debate of when the spirit left the body influenced the practice of dissection within the university setting. The universities in the south believed that the soul only animated the body and left immediately upon death. Because of this, the body while still important, went from being a subject to an object. However, in the north they believed that it took longer for the soul to leave as it was an integral part of the body. Though medical practice had become a professional and institutionalized field, the argument of the soul in the case of dissection shows that the foundation of religion was still an important part of medical thought in the late Middle Ages.

Medical universities in medieval Europe

Medicine was not a formal area of study in early medieval medicine, but it grew in response to the proliferation of translated Greek and Arabic medical texts in the 11th century. Western Europe also experienced economic, population and urban growth in the 12th and 13th centuries leading to the ascent of medieval medical universities. The University of Salerno was considered to be a renowned provenance of medical practitioners in the 9th and 10th centuries, but was not recognized as an official medical university until 1231. The founding of the Universities of Paris (1150), Bologna (1158), Oxford (1167), Montpelier (1181), Padua (1222) and Lleida (1297) extended the initial work of Salerno across Europe, and by the 13th century, medical leadership had passed to these newer institutions. Despite Salerno's important contributions to the foundation of the medical curriculum, scholars do not consider Salerno to be one of the medieval medical universities. This is because the formal establishment of a medical curriculum occurred after the decline of Salerno's grandeur of being a center for academic medicine.

The medieval medical universities' central concept concentrated on the balance between the humors and "in the substances used for therapeutic purposes". The curriculum's secondary concept focused on medical astrology, where celestial events were thought to influence health and disease. The medical curriculum was designed to train practitioners. Teachers of medical students were often successful physicians, practicing in conjunction with teaching. The curriculum of academic medicine was fundamentally based on translated texts and treatises attributed to Hippocrates and Galen as well as Arabic medical texts. At Montpellier's Faculty of Medicine professors were required in 1309 to possess Galen's books which described humors, De complexionibus, De virtutibus naturalibus, De criticis diebu so that they could teach students about Galen's medical theory. The translated works of Hippocrates and Galen were often incomplete, and were mediated with Arabic medical texts for their "independent contributions to treatment and to herbal pharmacology". Although anatomy was taught in academic medicine through the dissection of cadavers, surgery was largely independent from medical universities. The University of Bologna was the only university to grant degrees in surgery. Academic medicine also focused on actual medical practice where students would study individual cases and observe the professor visiting patients.

The required number of years to become a licensed physician varied among universities. Montpellier required students without their masters of arts to complete three and a half years of formal study and six months of outside medical practice. In 1309, the curriculum of Montpellier was changed to six years of study and eight months of outside medical practice for those without a masters of arts, whereas those with a masters of arts were only subjected to five years of study with eight months of outside medical practice. The university of Bologna required three years of philosophy, three years of astrology, and four years of attending medical lectures.

Medical practitioners

Members of religious orders were major sources of medical knowledge and cures. There appears to have been some controversy regarding the appropriateness of medical practice for members of religious orders. The Decree of the Second Lateran Council of 1139 advised the religious to avoid medicine because it was a well-paying job with higher social status than was appropriate for the clergy. However, this official policy was not often enforced in practice and many religious continued to practice medicine.

There were many other medical practitioners besides clergy. Academically trained doctors were particularly important in cities with universities. Medical faculty at universities figured prominently in defining medical guilds and accepted practices as well as the required qualifications for physicians. Beneath these university-educated physicians there existed a whole hierarchy of practitioners. Wallis suggests a social hierarchy with these university educated physicians on top, followed by "learned surgeons; craft-trained surgeons; barber surgeons, who combined bloodletting with the removal of "superfluities" from the skin and head; itinerant specialist such as dentist and oculists; empirics; midwives; clergy who dispensed charitable advice and help; and, finally, ordinary family and neighbors". Each of these groups practiced medicine in their own capacity and contributed to the overall culture of medicine.

Hospital system

In the Medieval period the term hospital encompassed hostels for travellers, dispensaries for poor relief, clinics and surgeries for the injured, and homes for the blind, lame, elderly, and mentally ill. Monastic hospitals developed many treatments, both therapeutic and spiritual.

During the thirteenth century an immense number of hospitals were built. The Italian cities were the leaders of the movement. Milan had no fewer than a dozen hospitals and Florence before the end of the fourteenth century had some thirty hospitals. Some of these were very beautiful buildings. At Milan a portion of the general hospital was designed by Bramante and another part of it by Michelangelo. The Hospital in Sienna, built in honor of St. Catherine, has been famous ever since. Everywhere throughout Europe this hospital movement spread. Virchow, the great German pathologist, in an article on hospitals, showed that every city of Germany of five thousand inhabitants had its hospital. He traced all of this hospital movement to Pope Innocent III, and though he was least papistically inclined, Virchow did not hesitate to give extremely high praise to this pontiff for all that he had accomplished for the benefit of children and suffering mankind.

Hospitals began to appear in great numbers in France and England. Following the French Norman invasion into England, the explosion of French ideals led most Medieval monasteries to develop a hospitium or hospice for pilgrims. This hospitium eventually developed into what we now understand as a hospital, with various monks and lay helpers providing the medical care for sick pilgrims and victims of the numerous plagues and chronic diseases that afflicted Medieval Western Europe. Benjamin Gordon supports the theory that the hospital – as we know it – is a French invention, but that it was originally developed for isolating lepers and plague victims, and only later undergoing modification to serve the pilgrim.

Owing to a well-preserved 12th-century account of the monk Eadmer of the Canterbury cathedral, there is an excellent account of Bishop Lanfranc's aim to establish and maintain examples of these early hospitals:

But I must not conclude my work by omitting what he did for the poor outside the walls of the city Canterbury. In brief, he constructed a decent and ample house of stone…for different needs and conveniences. He divided the main building into two, appointing one part for men oppressed by various kinds of infirmities and the other for women in a bad state of health. He also made arrangements for their clothing and daily food, appointing ministers and guardians to take all measures so that nothing should be lacking for them.

Later developments

Anathomia, 1541
 
Corpus physicum, from Liber de arte Distillandi de Compositis, 1512

High medieval surgeons like Mondino de Liuzzi pioneered anatomy in European universities and conducted systematic human dissections. Unlike pagan Rome, high medieval Europe did not have a complete ban on human dissection. However, Galenic influence was still so prevalent that Mondino and his contemporaries attempted to fit their human findings into Galenic anatomy.

During the period of the Renaissance from the mid 1450s onward, there were many advances in medical practice. The Italian Girolamo Fracastoro (1478–1553) was the first to propose that epidemic diseases might be caused by objects outside the body that could be transmitted by direct or indirect contact. He also proposed new treatments for diseases such as syphilis.

In 1543 the Flemish Scholar Andreas Vesalius wrote the first complete textbook on human anatomy: "De Humani Corporis Fabrica", meaning "On the Fabric of the Human Body". Much later, in 1628, William Harvey explained the circulation of blood through the body in veins and arteries. It was previously thought that blood was the product of food and was absorbed by muscle tissue.

During the 16th century, Paracelsus, like Girolamo, discovered that illness was caused by agents outside the body such as bacteria, not by imbalances within the body.

The French army doctor Ambroise Paré, born in 1510, revived the ancient Greek method of tying off blood vessels. After amputation the common procedure was to cauterize the open end of the amputated appendage to stop the haemorrhaging. This was done by heating oil, water, or metal and touching it to the wound to seal off the blood vessels. Pare also believed in dressing wounds with clean bandages and ointments, including one he made himself composed of eggs, oil of roses, and turpentine. He was the first to design artificial hands and limbs for amputation patients. On one of the artificial hands, the two pairs of fingers could be moved for simple grabbing and releasing tasks and the hand looked perfectly natural underneath a glove.

Medical catastrophes were more common in the late Middle Ages and the Renaissance than they are today. During the Renaissance, trade routes were the perfect means of transportation for disease. Eight hundred years after the Plague of Justinian, the bubonic plague returned to Europe. Starting in Asia, the Black Death reached Mediterranean and western Europe in 1348 (possibly from Italian merchants fleeing fighting in Crimea), and killed 25 million Europeans in six years, approximately 1/3 of the total population and up to a 2/3 in the worst-affected urban areas. Before Mongols left besieged Crimean Kaffa the dead or dying bodies of the infected soldiers were loaded onto catapults and launched over Kaffa's walls to infect those inside. This incident was among the earliest known examples of biological warfare and is credited as being the source of the spread of the Black Death into Europe.

The plague repeatedly returned to haunt Europe and the Mediterranean from 14th through 17th centuries. Notable later outbreaks include the Italian Plague of 1629–1631, the Great Plague of Seville (1647–1652), the Great Plague of London (1665–1666), the Great Plague of Vienna (1679), the Great Plague of Marseille in 1720–1722 and the 1771 plague in Moscow.

Before the Spanish discovered the New World (continental America), the deadly infections of smallpox, measles, and influenza were unheard of. The Native Americans did not have the immunities the Europeans developed through long contact with the diseases. Christopher Columbus ended the Americas' isolation in 1492 while sailing under the flag of Castile, Spain. Deadly epidemics swept across the Caribbean. Smallpox wiped out villages in a matter of months. The island of Hispaniola had a population of 250,000 Native Americans. 20 years later, the population had dramatically dropped to 6,000. 50 years later, it was estimated that approximately 500 Native Americans were left. Smallpox then spread to the area which is now Mexico where it then helped destroy the Aztec Empire. In the 1st century of Spanish rule in what is now Mexico, 1500–1600, Central and South Americans died by the millions. By 1650, the majority of New Spain (now Mexico) population had perished.

Contrary to popular belief bathing and sanitation were not lost in Europe with the collapse of the Roman Empire. Bathing in fact did not fall out of fashion in Europe until shortly after the Renaissance, replaced by the heavy use of sweat-bathing and perfume, as it was thought in Europe that water could carry disease into the body through the skin. Medieval church authorities believed that public bathing created an environment open to immorality and disease. Roman Catholic Church officials even banned public bathing in an unsuccessful effort to halt syphilis epidemics from sweeping Europe.

Battlefield medicine

Camp and movement

In order for an army to be in good fighting condition, it must maintain the health of its soldiers. One way of doing this is knowing the proper location to set up camp. Military camps were not to be set up in any sort of marshy region. Marsh lands tend to have standing water, which can draw in mosquitos. Mosquitos, in turn, can carry deadly disease, such as malaria. As the camp and troops were needed to be moved, the troops would be wearing heavy soled shoes in order to prevent wear on soldiers' feet. Waterborne illness has also remained an issue throughout the centuries. When soldiers would look for water they would be searching for some sort of natural spring or other forms of flowing water. When water sources were found, any type of rotting wood, or plant material, would be removed before the water was used for drinking. If these features could not be removed, then water would be drawn from a different part of the source. By doing this the soldiers were more likely to be drinking from a safe source of water. Thus, water borne bacteria had less chance of making soldiers ill. One process used to check for dirty water was to moisten a fine white linen cloth with the water and leave it out to dry. If the cloth had any type of stain, it would be considered to be diseased. If the cloth was clean, the water was healthy and drinkable. Freshwater also assists with sewage disposal, as well as wound care. Thus, a source of fresh water was a preemptive measure taken to defeat disease and keep men healthy once they were wounded.

Physicians

Surgeons

In Medieval Europe the surgeon's social status improved greatly as their expertise was needed on the battlefield. Owing to the number of patients, warfare created a unique learning environment for these surgeons. The dead bodies also provided an opportunity for learning. The corpses provided a means to learn through hands on experience. As war declined, the need for surgeons declined as well. This would follow a pattern, where the status of the surgeon would flux in regards to whether or not there was actively a war going on.

First medical schools

Medical school also first appeared in the Medieval period. This created a divide between physicians trained in the classroom and physicians who learned their trade through practice. The divide created a shift leading to physicians trained in the classroom to be of higher esteem and more knowledgeable. Despite this, there was still a lack of knowledge by physicians in the militaries. The knowledge of the militaries' physicians was greatly acquired through first hand experience. In the Medical schools, physicians such as Galen were referenced as the ultimate source of knowledge. Thus, the education in the schools was aimed at proving these ancient physicians were correct. This created issues as Medieval knowledge surpassed the knowledge of these ancient physicians. In the scholastic setting it still became practice to reference ancient physicians or the other information being presented was not taken seriously.

Level of care

The soldiers that received medical attention was most likely from a physician who was not well trained. To add to this, a soldier did not have a good chance of surviving a wound that needed specific, specialized, or knowledgeable treatment. Surgery was oftentimes performed by a surgeon who knew it as a craft. There were a handful of surgeons such as Henry de Mondeville, who were very proficient and were employed by Kings such as King Phillip. However; this was not always enough to save kings’ lives, as King Richard I of England died of wounds at the siege of Chalus in AD 1199 due to an unskilled arrow extraction.

Wound treatment

Arrow extraction

Treating a wound was and remains the most crucial part of any battlefield medicine, as this is what keeps soldiers alive. As remains true on the modern battlefield, hemorrhaging and shock were the number one killers. Thus, the initial control of these two things were of the utmost importance in medieval medicine. Items such as the long bow were used widely throughout the medieval period, thus making arrow extracting a common practice among the armies of Medieval Europe. When extracting an arrow, there were three guidelines that were to be followed. The physicians should first examine the position of the arrow and the degree to which its parts are visible, the possibility of it being poisoned, the location of the wound, and the possibility of contamination with dirt and other debris. The second rule was to extract it delicately and swiftly. The third rule was to stop the flow of blood from the wound.

The arrowheads that were used against troops were typically not barbed or hooked, but were slim and designed to penetrate armor such as chain mail. Although this design may be useful as wounds were smaller, these arrows were more likely to embed in bone making them harder to extract. If the arrow happened to be barbed or hooked it made the removal more challenging. Physicians would then let the wound putrefy, thus making the tissue softer and easier for arrow extraction. After a soldier was wounded he was taken to a field hospital where the wound was assessed and cleaned, then if time permitted the soldier was sent to a camp hospital where his wound was closed for good and allowed to heal.

Blade and knife wounds

Another common injury faced was those caused by blades. If the wound was too advanced for simple stitch and bandage, it would often result in amputation of the limb. Surgeons of the Medieval battlefield had the practice of amputation down to an art. Typically it would have taken less than a minute for a surgeon to remove the damaged limb, and another three to four minutes to stop the bleeding. The surgeon would first place the limb on a block of wood and tie ligatures above and below the site of surgery. Then the soft tissue would be cut through, thus exposing the bone, which was then sawed through. The stump was then bandaged and left to heal. The rates of mortality among amputation patients was around 39%, that number grew to roughly 62% for those patients with a high leg amputation. Ideas of medieval surgery are often construed in modern minds as barbaric, as our view is diluted with our own medical knowledge. Surgery and medical practice in general was at its height of advancement for its time. All procedures were done with the intent to save lives, not to cause extra pain and suffering. The speed of the procedure by the surgeon was an important factor, as the limit of pain and blood loss lead to higher survival rates among these procedures.

Injuries to major arteries that caused mass blood loss were not usually treatable as shown in the evidence of archeological remains. We know this as wounds severe enough to sever major arteries left incisions on the bone which is excavated by archaeologists. Wounds were also taught to be covered to improve healing. Forms of antiseptics were also used in order to stave off infection. To dress wounds all sorts of dressing were used such as grease, absorbent dressings, spider webs, honey, ground shellfish, clay and turpentine. Some of these methods date back to Roman battlefield medicine.

Bone breakage

Sieges were a dangerous place to be, as broken bones became an issue, with soldiers falling while they scaled the wall amongst other methods of breakage. Typically, it was long bones that were fractured. These fractures were manipulated to get the bones back into their correct location. Once they were in their correct location, the wound was immobilized by either a splint or a plaster mold. The plaster mold (an early cast) was made of flour and egg whites and was applied to the injured area. Both of these methods left the bone immobilized and gave it a chance to heal.

Burn treatment

Burn treatment also required a specific approach by physicians of the time. This was due to burning oil and arrows or boiling water, which were used in combat. In the early stages of treatment there was an attempt to stop the formation of blisters. The burn was prevented from becoming dry by using anointments placed on the burn. These anointments typically consisted of vinegar, egg, rose oil, opium, and a multitude of different herbs. The ointment was applied to affected area, and then reapplied as needed.

Ancient Greek astronomy

From Wikipedia, the free encyclopedia
 
The Antikythera Mechanism was an analog computer from 150–100 BC designed to calculate the positions of astronomical objects.

Greek astronomy is astronomy written in the Greek language in classical antiquity. Greek astronomy is understood to include the Ancient Greek, Hellenistic, Greco-Roman, and Late Antiquity eras. It is not limited geographically to Greece or to ethnic Greeks, as the Greek language had become the language of scholarship throughout the Hellenistic world following the conquests of Alexander. This phase of Greek astronomy is also known as Hellenistic astronomy, while the pre-Hellenistic phase is known as Classical Greek astronomy. During the Hellenistic and Roman periods, much of the Greek and non-Greek astronomers working in the Greek tradition studied at the Museum and the Library of Alexandria in Ptolemaic Egypt.

The development of astronomy by the Greek and notably Hellenistic astronomers is considered to be a major phase in the history of astronomy. Greek astronomy is characterized by seeking a geometrical model for celestial phenomena. Most of the names of the stars, planets, and constellations of the northern hemisphere are inherited from the terminology of Greek astronomy, which are however indeed transliterated from the empirical knowledge in Babylonian astronomy, characterized by its theoretical model formulation in terms of algebraic and numerical relations, and to a lesser extent from Egyptian astronomy. Later, the scientific work by astronomers and mathematicians of the arbo-moslem empire, of diverse backgrounds and religions (such as the Syriac Christians), to translate, comment and then correct Ptolemy's Almagest, influenced in their turn Indian and Western European astronomy.

Archaic Greek astronomy

Both Hesiod and Homer were directly and deeply influenced by the mythologies of Phoenicia and Mesopotamia, thanks to Phoenician sailors and literate Babylonians and Arameans, who went to Lefkandi in Greece during the Orientalizing Period, between c. 750 BC and c. 630 BC for maritime commerce and to live and work. The Babylonians and Arameans came from the Levant and North Syria where they were forcibly transported in their hundreds of thousands by the Assyrian army from Babylonia during the reign of the last six Assyrian kings, from 745 BC to 627 BC. Hesiod's theogony and cosmogony are the Greek version of two Phoenician myths. The Odyssey of Homer is inspired by the Epopee of Gilgamesh. See for references the work of M.L. West et W. Burkret.

In this context it is reasonable to suggest that whatever Homer and Hesiod hinted at in their small contributions comes from the knowledge they acquired from the Oriental people they rubbed shoulder with in Lefkandi, the center of Greek culture at that time. References to identifiable stars and constellations appear in the writings of Homer and Hesiod, the earliest surviving examples of Greek literature. In the oldest European texts, the Iliad and the Odyssey, Homer has noted several astronomical phenomena including solar eclipses. In the Iliad and the Odyssey, Homer refers to the following celestial objects:

Anaximander

Although there is no material evidence of much of the work done by Greek philosophers between 600-300 BC, it is believed that Anaximander (c. 610 BC–c. 546 BC) described a cyclical Earth suspended in the center of the cosmos surrounded by rings of fire, and that Philolaus (c. 480 BC–c. 405 BC) the Pythagorean described a cosmos in which the stars and ten bodies including the planets, the Sun, the Moon, the Earth, and counter-Earth (Antichthon) circle an unseen central fire. It is hence pure conjecture that Greeks of the 6th and 5th centuries BC were aware of the planets and speculated about the structure of the cosmos. Also, a more detailed description about the cosmos, Stars, Sun, Moon and the Earth can be found in the Orphism, which dates back to the end of the 5th century BC. Within the lyrics of the Orphic poems we can find remarkable information such as that the Earth is round, it has an axis and it moves around it in one day, it has three climate zones and that the Sun magnetizes the Stars and planets.

The Planets in Early Greek Astronomy

The term "planet" comes from the Greek term πλανήτης (planētēs), meaning "wanderer", as ancient astronomers noted how certain points of lights moved across the sky in relation to the other stars. Five extraterrestrial planets can be seen with the naked eye: Mercury, Venus, Mars, Jupiter, and Saturn, the Greek names being Hermes, Aphrodite, Ares, Zeus and Cronus. Sometimes the luminaries, the Sun and Moon, are added to the list of naked eye planets to make a total of seven. Since the planets disappear from time to time when they approach the Sun, careful attention is required to identify all five. Observations of Venus are not straightforward. Early Greek astronomers thought that the evening and morning appearances of Venus represented two different objects, calling it Hesperus ("evening star") when it appeared in the western evening sky and Phosphorus ("light-bringer") when it appeared in the eastern morning sky. They eventually came to recognize that both objects were the same planet. Pythagoras is given credit for this realization.

Eudoxan astronomy

In classical Greece, astronomy was a branch of mathematics; astronomers sought to create geometrical models that could imitate the appearances of celestial motions. This tradition began with the Pythagoreans, who placed astronomy among the four mathematical arts (along with arithmetic, geometry, and music). The study of number comprising the four arts was later called the Quadrivium.

Although he was not a creative mathematician, Plato (427–347 BC) included the quadrivium as the basis for philosophical education in the Republic. He encouraged a younger mathematician, Eudoxus of Cnidus (c. 410 BC–c. 347 BC), to develop a system of Greek astronomy. According to a modern historian of science, David Lindberg:

In their work we find (1) a shift from stellar to planetary concerns, (2) the creation of a geometrical model, the "two-sphere model," for the representation of stellar and planetary phenomena, and (3) the establishment of criteria governing theories designed to account for planetary observations.

The two-sphere model is a geocentric model that divides the cosmos into two regions, a spherical Earth, central and motionless (the sublunary sphere) and a spherical heavenly realm centered on the Earth, which may contain multiple rotating spheres made of aether.

Renaissance woodcut illustrating the two-sphere model.

Plato's main books on cosmology are the Timaeus and the Republic. In them he described the two-sphere model and said there were eight circles or spheres carrying the seven planets and the fixed stars. According to the "Myth of Er" in the Republic, the cosmos is the Spindle of Necessity, attended by Sirens and spun by the three daughters of the Goddess Necessity known collectively as the Moirai or Fates.

According to a story reported by Simplicius of Cilicia (6th century), Plato posed a question for the Greek mathematicians of his day: "By the assumption of what uniform and orderly motions can the apparent motions of the planets be accounted for?" (quoted in Lloyd 1970, p. 84). Plato proposed that the seemingly chaotic wandering motions of the planets could be explained by combinations of uniform circular motions centered on a spherical Earth, a novel idea in the 4th century.

Eudoxus rose to the challenge by assigning to each planet a set of concentric spheres. By tilting the axes of the spheres, and by assigning each a different period of revolution, he was able to approximate the celestial "appearances." Thus, he was the first to attempt a mathematical description of the motions of the planets. A general idea of the content of On Speeds, his book on the planets, can be gleaned from Aristotle's Metaphysics XII, 8, and a commentary by Simplicius on De caelo, another work by Aristotle. Since all his own works are lost, our knowledge of Eudoxus is obtained from secondary sources. Aratus's poem on astronomy is based on a work of Eudoxus, and possibly also Theodosius of Bithynia's Sphaerics. They give us an indication of his work in spherical astronomy as well as planetary motions.

Callippus, a Greek astronomer of the 4th century, added seven spheres to Eudoxus' original 27 (in addition to the planetary spheres, Eudoxus included a sphere for the fixed stars). Aristotle described both systems, but insisted on adding "unrolling" spheres between each set of spheres to cancel the motions of the outer set. Aristotle was concerned about the physical nature of the system; without unrollers, the outer motions would be transferred to the inner planets.

Hellenistic astronomy

Planetary models and observational astronomy

The Eudoxan system had several critical flaws. One was its inability to predict motions exactly. Callippus' work may have been an attempt to correct this flaw. A related problem is the inability of his models to explain why planets appear to change speed. A third flaw is its inability to explain changes in the brightness of planets as seen from Earth. Because the spheres are concentric, planets will always remain at the same distance from Earth. This problem was pointed out in Antiquity by Autolycus of Pitane (c. 310 BC).

Apollonius of Perga (c. 262 BC–c. 190 BC) responded by introducing two new mechanisms that allowed a planet to vary its distance and speed: the eccentric deferent and the deferent and epicycle. The deferent is a circle carrying the planet around the Earth. (The word deferent comes from the Greek fero φέρω "to carry"and Latin ferro, ferre, meaning "to carry.") An eccentric deferent is slightly off-center from Earth. In a deferent and epicycle model, the deferent carries a small circle, the epicycle, which carries the planet. The deferent-and-epicycle model can mimic the eccentric model, as shown by Apollonius' theorem. It can also explain retrogradation, which happens when planets appear to reverse their motion through the zodiac for a short time. Modern historians of astronomy have determined that Eudoxus' models could only have approximated retrogradation crudely for some planets, and not at all for others.

In the 2nd century BC, Hipparchus, aware of the extraordinary accuracy with which Babylonian astronomers could predict the planets' motions, insisted that Greek astronomers achieve similar levels of accuracy. Somehow he had access to Babylonian observations or predictions, and used them to create better geometrical models. For the Sun, he used a simple eccentric model, based on observations of the equinoxes, which explained both changes in the speed of the Sun and differences in the lengths of the seasons. For the Moon, he used a deferent and epicycle model. He could not create accurate models for the remaining planets, and criticized other Greek astronomers for creating inaccurate models.

Hipparchus also compiled a star catalogue. According to Pliny the Elder, he observed a nova (new star). So that later generations could tell whether other stars came to be, perished, moved, or changed in brightness, he recorded the position and brightness of the stars. Ptolemy mentioned the catalogue in connection with Hipparchus' discovery of precession. (Precession of the equinoxes is a slow motion of the place of the equinoxes through the zodiac, caused by the shifting of the Earth's axis). Hipparchus thought it was caused by the motion of the sphere of fixed stars.

Heliocentrism and cosmic scales

Aristarchus's 3rd-century BCE calculations on the relative sizes of (from left) the Sun, Earth and Moon, from a 10th-century CE Greek copy

In the 3rd century BC, Aristarchus of Samos proposed an alternate cosmology (arrangement of the universe): a heliocentric model of the Solar System, placing the Sun, not the Earth, at the center of the known universe (hence he is sometimes known as the "Greek Copernicus"). His astronomical ideas were not well-received, however, and only a few brief references to them are preserved. We know the name of one follower of Aristarchus: Seleucus of Seleucia.

Aristarchus also wrote a book On the Sizes and Distances of the Sun and Moon, which is his only work to have survived. In this work, he calculated the sizes of the Sun and Moon, as well as their distances from the Earth in Earth radii. Shortly afterwards, Eratosthenes calculated the size of the Earth, providing a value for the Earth radii which could be plugged into Aristarchus' calculations. Hipparchus wrote another book On the Sizes and Distances of the Sun and Moon, which has not survived. Both Aristarchus and Hipparchus drastically underestimated the distance of the Sun from the Earth.

Astronomy in the Greco-Roman and Late Antique eras

Hipparchus is considered to have been among the most important Greek astronomers, because he introduced the concept of exact prediction into astronomy. He was also the last innovative astronomer before Claudius Ptolemy, a mathematician who worked at Alexandria in Roman Egypt in the 2nd century. Ptolemy's works on astronomy and astrology include the Almagest, the Planetary Hypotheses, and the Tetrabiblos, as well as the Handy Tables, the Canobic Inscription, and other minor works.

Ptolemaic astronomy

The Almagest is one of the most influential books in the history of Western astronomy. In this book, Ptolemy explained how to predict the behavior of the planets, as Hipparchus could not, with the introduction of a new mathematical tool, the equant. The Almagest gave a comprehensive treatment of astronomy, incorporating theorems, models, and observations from many previous mathematicians. This fact may explain its survival, in contrast to more specialized works that were neglected and lost. Ptolemy placed the planets in the order that would remain standard until it was displaced by the heliocentric system and the Tychonic system:

  1. Moon
  2. Mercury
  3. Venus
  4. Sun
  5. Mars
  6. Jupiter
  7. Saturn
  8. Fixed stars

The extent of Ptolemy's reliance on the work of other mathematicians, in particular his use of Hipparchus' star catalogue, has been debated since the 19th century. A controversial claim was made by Robert R. Newton in the 1970s. in The Crime of Claudius Ptolemy, he argued that Ptolemy faked his observations and falsely claimed the catalogue of Hipparchus as his own work. Newton's theories have not been adopted by most historians of astronomy.

Claudius Ptolemy of Alexandria performed a deep examination of the shape and motion of the Earth and celestial bodies. He worked at the museum, or instructional center, school and library of manuscripts in Alexandria. Ptolemy is responsible for a lot of concepts, but one of his most famous works summarizing these concepts is the Almagest, a series of 13 books where he presented his astronomical theories. Ptolemy discussed the idea of epicycles and center of the world. The epicycle center moves at a constant rate in a counter clockwise direction. Once other celestial bodies, such as the planets, were introduced into this system, it became more complex. The models for Jupiter, Saturn, and Mars included the center of the circle, the equant point, the epicycle, and an observer from earth to give perspective. The discovery of this model was that the center of the Mercury and Venus epicycles must always be colinear with the Sun. This assures of bounded elongation. (Bowler, 2010, 48) Bounded elongation is the angular distance of celestial bodies from the center of the universe. Ptolemy's model of the cosmos and his studies landed him an important place in history in the development of modern-day science. The cosmos was a concept further developed by Ptolemy that included equant circles, however Copernicus model of the universe was simpler. In the Ptolemaic system, the Earth was at the center of the universe with the Moon, the Sun, and five planets circling it. The circle of fixed stars marked the outermost sphere of the universe and beyond that would be the philosophical “aether” realm. The Earth was at the exact center of the cosmos, most likely because people at the time believed the Earth had to be at the center of the universe because of the deductions made by observers in the system. The sphere carrying the Moon is described as the boundary between the corruptible and changing sublunary world and the incorruptible and unchanging heavens above it (Bowler, 2010, 26). The heavens were defined as incorruptible and unchanging based on theology and mythology of the past. The Almagest introduced the idea of the sphericity of heavens. The assumption is that the sizes and mutual distances of the stars must appear to vary however one supposes the earth to be positioned, yet no such variation occurred (Bowler, 2010, 55), The aether is the area that describes the universe above the terrestrial sphere. This component of the atmosphere is unknown and named by philosophers, though many do not know what lies beyond the realm of what has been seen by human beings. The aether is used to affirm the sphericity of the heavens and this is confirmed by the belief that different shapes have an equal boundary and those with more angles are greater, the circle is greater than all other surfaces, and a sphere greater than all other solids. Therefore, through physical considerations, and heavenly philosophy, there is an assumption that the heavens must be spherical. The Almagest also suggested that the earth was spherical because of similar philosophy. The differences in the hours across the globe are proportional to the distances between the spaces at which they are being observed. Therefore, it can be deduced that the Earth is spherical because of the evenly curving surface and the differences in time that was constant and proportional. In other words, the Earth must be spherical because they change in time-zones across the world occur in a uniform fashion, as with the rotation of a sphere. The observation of eclipses further confirmed these findings because everyone on Earth could see a lunar eclipse, for example, but it would be at different hours. The Almagest also suggest that the Earth is at the center of the universe. The basis on which this is found is in the fact that six zodiac signs can be seen above Earth, while at the same time the other signs are not visible (Bowler, 2010, 57). The way that we observe the increase and decrease of daylight would be different if the Earth was not at the center of the universe. Though this view later proofed to be invalid, this was a good proponent to the discussion of the design of the universe. Ideas on the universe were later developed and advanced through the works of other philosophers such as Copernicus, who built on ideas through his knowledge of the world and God.

A few mathematicians of Late Antiquity wrote commentaries on the Almagest, including Pappus of Alexandria as well as Theon of Alexandria and his daughter Hypatia. Ptolemaic astronomy became standard in medieval western European and Islamic astronomy until it was displaced by Maraghan, heliocentric and Tychonic systems by the 16th century. However, recently discovered manuscripts reveal that Greek astrologers of Antiquity continued using pre-Ptolemaic methods for their calculations (Aaboe, 2001).

Influence on Indian astronomy

Greek equatorial sun dial, Ai-Khanoum, Afghanistan 3rd-2nd century BC.

Hellenistic astronomy is known to have been practiced near India in the Greco-Bactrian city of Ai-Khanoum from the 3rd century BC. Various sun-dials, including an equatorial sundial adjusted to the latitude of Ujjain have been found in archaeological excavations there. Numerous interactions with the Mauryan Empire, and the later expansion of the Indo-Greeks into India suggest that some transmission may have happened during that period.

Several Greco-Roman astrological treatises are also known to have been imported into India during the first few centuries of our era. The Yavanajataka ("Sayings of the Greeks") was translated from Greek to Sanskrit by Yavanesvara during the 2nd century, under the patronage of the Western Satrap Saka king Rudradaman I. Rudradaman's capital at Ujjain "became the Greenwich of Indian astronomers and the Arin of the Arabic and Latin astronomical treatises; for it was he and his successors who encouraged the introduction of Greek horoscopy and astronomy into India."

Later in the 6th century, the Romaka Siddhanta ("Doctrine of the Romans"), and the Paulisa Siddhanta (sometimes attributed as the "Doctrine of Paul" or in general the Doctrine of Paulisa muni) were considered as two of the five main astrological treatises, which were compiled by Varahamihira in his Pañca-siddhāntikā ("Five Treatises"). Varahamihira wrote in the Brihat-Samhita: "For, the Greeks are foreigners. This science is well established among them. Although they are revered as sages, how much more so is a twice-born person who knows the astral science."

Sources for Greek astronomy

Many Greek astronomical texts are known only by name, and perhaps by a description or quotations. Some elementary works have survived because they were largely non-mathematical and suitable for use in schools. Books in this class include the Phaenomena of Euclid and two works by Autolycus of Pitane. Three important textbooks, written shortly before Ptolemy's time, were written by Cleomedes, Geminus, and Theon of Smyrna. Books by Roman authors like Pliny the Elder and Vitruvius contain some information on Greek astronomy. The most important primary source is the Almagest, since Ptolemy refers to the work of many of his predecessors (Evans 1998, p. 24).

European science in the Middle Ages

For most medieval scholars, who believed that God created the universe according to geometric and harmonic principles, science – particularly geometry and astronomy – was linked directly to the divine. To seek these principles, therefore, would be to seek God.

European science in the Middle Ages comprised the study of nature, mathematics and natural philosophy in medieval Europe. Following the fall of the Western Roman Empire and the decline in knowledge of Greek, Christian Western Europe was cut off from an important source of ancient learning. Although a range of Christian clerics and scholars from Isidore and Bede to Jean Buridan and Nicole Oresme maintained the spirit of rational inquiry, Western Europe would see a period of scientific decline during the Early Middle Ages. However, by the time of the High Middle Ages, the region had rallied and was on its way to once more taking the lead in scientific discovery. Scholarship and scientific discoveries of the Late Middle Ages laid the groundwork for the Scientific Revolution of the Early Modern Period.

According to Pierre Duhem, who founded the academic study of medieval science as a critique of the Enlightenment-positivist theory of a 17th-century anti-Aristotelian and anticlerical scientific revolution, the various conceptual origins of that alleged revolution lay in the 12th to 14th centuries, in the works of churchmen such as Thomas Aquinas and Buridan.

In the context of this article, "Western Europe" refers to the European cultures bound together by the Catholic Church and the Latin language.

Western Europe

As Roman imperial power effectively ended in the West during the 5th century, Western Europe entered the Middle Ages with great difficulties that affected the continent's intellectual production dramatically. Most classical scientific treatises of classical antiquity written in Greek were unavailable, leaving only simplified summaries and compilations. Nonetheless, Roman and early medieval scientific texts were read and studied, contributing to the understanding of nature as a coherent system functioning under divinely established laws that could be comprehended in the light of reason. This study continued through the Early Middle Ages, and with the Renaissance of the 12th century, interest in this study was revitalized through the translation of Greek and Arabic scientific texts. Scientific study further developed within the emerging medieval universities, where these texts were studied and elaborated, leading to new insights into the phenomena of the universe. These advances are virtually unknown to the lay public of today, partly because most theories advanced in medieval science are today obsolete, and partly because of the caricature of Middle Ages as a supposedly "Dark Age" which placed "the word of religious authorities over personal experience and rational activity."

Early Middle Ages (AD 476–1000)

In the ancient world, Greek had been the primary language of science. Even under the Roman Empire, Latin texts drew extensively on Greek work, some pre-Roman, some contemporary; while advanced scientific research and teaching continued to be carried on in the Hellenistic side of the empire, in Greek. Late Roman attempts to translate Greek writings into Latin had limited success.

As the knowledge of Greek declined during the transition to the Middle Ages, the Latin West found itself cut off from its Greek philosophical and scientific roots. Most scientific inquiry came to be based on information gleaned from sources which were often incomplete and posed serious problems of interpretation. Latin-speakers who wanted to learn about science only had access to books by such Roman writers as Calcidius, Macrobius, Martianus Capella, Boethius, Cassiodorus, and later Latin encyclopedists. Much had to be gleaned from non-scientific sources: Roman surveying manuals were read for what geometry was included.

Ninth century diagram of the observed and computed positions of the seven planets on 18 March 816.

De-urbanization reduced the scope of education and by the 6th century teaching and learning moved to monastic and cathedral schools, with the center of education being the study of the Bible. Education of the laity survived modestly in Italy, Spain, and the southern part of Gaul, where Roman influences were most long-lasting. In the 7th century, learning began to emerge in Ireland and the Celtic lands, where Latin was a foreign language and Latin texts were eagerly studied and taught.

The leading scholars of the early centuries were clergymen for whom the study of nature was but a small part of their interest. They lived in an atmosphere which provided little institutional support for the disinterested study of natural phenomena. The study of nature was pursued more for practical reasons than as an abstract inquiry: the need to care for the sick led to the study of medicine and of ancient texts on drugs, the need for monks to determine the proper time to pray led them to study the motion of the stars, the need to compute the date of Easter led them to study and teach rudimentary mathematics and the motions of the Sun and Moon. Modern readers may find it disconcerting that sometimes the same works discuss both the technical details of natural phenomena and their symbolic significance.

Around 800, Charles the Great, assisted by the English monk Alcuin of York, undertook what has become known as the Carolingian Renaissance, a program of cultural revitalization and educational reform. The chief scientific aspect of Charlemagne's educational reform concerned the study and teaching of astronomy, both as a practical art that clerics required to compute the date of Easter and as a theoretical discipline. From the year 787 on, decrees were issued recommending the restoration of old schools and the founding of new ones throughout the empire. Institutionally, these new schools were either under the responsibility of a monastery, a cathedral or a noble court.

The scientific work of the period after Charlemagne was not so much concerned with original investigation as it was with the active study and investigation of ancient Roman scientific texts. This investigation paved the way for the later effort of Western scholars to recover and translate ancient Greek texts in philosophy and the sciences.

High Middle Ages (AD 1000–1300)

The translation of Greek and Arabic works allowed the full development of Christian philosophy and the method of scholasticism.

Beginning around the year 1050, European scholars built upon their existing knowledge by seeking out ancient learning in Greek and Arabic texts which they translated into Latin. They encountered a wide range of classical Greek texts, some of which had earlier been translated into Arabic, accompanied by commentaries and independent works by Islamic thinkers.

Gerard of Cremona is a good example: an Italian who traveled to Spain to copy a single text, he stayed on to translate some seventy works. His biography describes how he came to Toledo: "He was trained from childhood at centers of philosophical study and had come to a knowledge of all that was known to the Latins; but for love of the Almagest, which he could not find at all among the Latins, he went to Toledo; there, seeing the abundance of books in Arabic on every subject and regretting the poverty of the Latins in these things, he learned the Arabic language, in order to be able to translate."

Map of medieval universities. They started a new infrastructure which was needed for scientific communities.

This period also saw the birth of medieval universities, which benefited materially from the translated texts and provided a new infrastructure for scientific communities. Some of these new universities were registered as an institution of international excellence by the Holy Roman Empire, receiving the title of Studium Generale. Most of the early Studia Generali were found in Italy, France, England, and Spain, and these were considered the most prestigious places of learning in Europe. This list quickly grew as new universities were founded throughout Europe. As early as the 13th century, scholars from a Studium Generale were encouraged to give lecture courses at other institutes across Europe and to share documents, and this led to the current academic culture seen in modern European universities.

The rediscovery of the works of Aristotle allowed the full development of the new Christian philosophy and the method of scholasticism. By 1200 there were reasonably accurate Latin translations of the main works of Aristotle, Euclid, Ptolemy, Archimedes, and Galen—that is, of all the intellectually crucial ancient authors except Plato. Also, many of the medieval Arabic and Jewish key texts, such as the main works of Avicenna, Averroes and Maimonides now became available in Latin. During the 13th century, scholastics expanded the natural philosophy of these texts by commentaries (associated with teaching in the universities) and independent treatises. Notable among these were the works of Robert Grosseteste, Roger Bacon, John of Sacrobosco, Albertus Magnus, and Duns Scotus.

Scholastics believed in empiricism and supporting Roman Catholic doctrines through secular study, reason, and logic. The most famous was Thomas Aquinas (later declared a "Doctor of the Church"), who led the move away from the Platonic and Augustinian and towards Aristotelianism (although natural philosophy was not his main concern). Meanwhile, precursors of the modern scientific method can be seen already in Grosseteste's emphasis on mathematics as a way to understand nature and in the empirical approach admired by Roger Bacon.

Optical diagram showing light being refracted by a spherical glass container full of water (from Roger Bacon, De multiplicatione specierum).

Grosseteste was the founder of the famous Oxford Franciscan school. He built his work on Aristotle's vision of the dual path of scientific reasoning. Concluding from particular observations into a universal law, and then back again: from universal laws to prediction of particulars. Grosseteste called this "resolution and composition". Further, Grosseteste said that both paths should be verified through experimentation in order to verify the principals. These ideas established a tradition that carried forward to Padua and Galileo Galilei in the 17th century.

Under the tuition of Grosseteste and inspired by the writings of Arab alchemists who had preserved and built upon Aristotle's portrait of induction, Bacon described a repeating cycle of observation, hypothesis, experimentation, and the need for independent verification. He recorded the manner in which he conducted his experiments in precise detail so that others could reproduce and independently test his results - a cornerstone of the scientific method, and a continuation of the work of researchers like Al Battani.

Bacon and Grosseteste conducted investigations into optics, although much of it was similar to what was being done at the time by Arab scholars. Bacon did make a major contribution to the development of science in medieval Europe by writing to the Pope to encourage the study of natural science in university courses and compiling several volumes recording the state of scientific knowledge in many fields at the time. He described the possible construction of a telescope, but there is no strong evidence of his having made one.

Late Middle Ages (AD 1300–1500)

The first half of the 14th century saw the scientific work of great thinkers. The logic studies by William of Occam led him to postulate a specific formulation of the principle of parsimony, known today as Occam's razor. This principle is one of the main heuristics used by modern science to select between two or more underdetermined theories, though it is only fair to point out that this principle was employed explicitly by both Aquinas and Aristotle before him.

As Western scholars became more aware (and more accepting) of controversial scientific treatises of the Byzantine and Islamic Empires these readings sparked new insights and speculation. The works of the early Byzantine scholar John Philoponus inspired Western scholars such as Jean Buridan to question the received wisdom of Aristotle's mechanics. Buridan developed the theory of impetus which was a step towards the modern concept of inertia. Buridan anticipated Isaac Newton when he wrote:

Galileo's demonstration of the law of the space traversed in case of uniformly varied motion – as Oresme had demonstrated centuries earlier.

. . . after leaving the arm of the thrower, the projectile would be moved by an impetus given to it by the thrower and would continue to be moved as long as the impetus remained stronger than the resistance, and would be of infinite duration were it not diminished and corrupted by a contrary force resisting it or by something inclining it to a contrary motion.

Thomas Bradwardine and his partners, the Oxford Calculators of Merton College, Oxford, distinguished kinematics from dynamics, emphasizing kinematics, and investigating instantaneous velocity. They formulated the mean speed theorem: a body moving with constant velocity travels distance and time equal to an accelerated body whose velocity is half the final speed of the accelerated body. They also demonstrated this theorem—the essence of "The Law of Falling Bodies"—long before Galileo, who has gotten the credit for this.

In his turn, Nicole Oresme showed that the reasons proposed by the physics of Aristotle against the movement of the Earth were not valid and adduced the argument of simplicity for the theory that the Earth moves, and not the heavens. Despite this argument in favor of the Earth's motion, Oresme fell back on the commonly held opinion that "everyone maintains, and I think myself, that the heavens do move and not the earth."

The historian of science Ronald Numbers notes that the modern scientific assumption of methodological naturalism can be also traced back to the work of these medieval thinkers:

By the late Middle Ages the search for natural causes had come to typify the work of Christian natural philosophers. Although characteristically leaving the door open for the possibility of direct divine intervention, they frequently expressed contempt for soft-minded contemporaries who invoked miracles rather than searching for natural explanations. The University of Paris cleric Jean Buridan (a. 1295–ca. 1358), described as "perhaps the most brilliant arts master of the Middle Ages," contrasted the philosopher’s search for "appropriate natural causes" with the common folk’s erroneous habit of attributing unusual astronomical phenomena to the supernatural. In the fourteenth century the natural philosopher Nicole Oresme (ca. 1320–82), who went on to become a Roman Catholic bishop, admonished that, in discussing various marvels of nature, "there is no reason to take recourse to the heavens, the last refuge of the weak, or demons, or to our glorious God as if He would produce these effects directly, more so than those effects whose causes we believe are well known to us."

However, a series of events that would be known as the Crisis of the Late Middle Ages was under its way. When came the Black Death of 1348, it sealed a sudden end to the previous period of scientific progress. The plague killed a third of the people in Europe, especially in the crowded conditions of the towns, where the heart of innovations lay. Recurrences of the plague and other disasters caused a continuing decline of population for a century.

Renaissance (15th century)

The 15th century saw the beginning of the cultural movement of the Renaissance. The rediscovery of Greek scientific texts, both ancient and medieval, was accelerated as the Byzantine Empire fell to the Ottoman Turks and many Byzantine scholars sought refuge in the West, particularly Italy.

Also, the invention of printing was to have great effect on European society: the facilitated dissemination of the printed word democratized learning and allowed a faster propagation of new ideas.

When the Renaissance moved to Northern Europe that science would be revived, by figures as Copernicus, Francis Bacon, and Descartes (though Descartes is often described as an early Enlightenment thinker, rather than a late Renaissance one).

Byzantine and Islamic influences

Byzantine interactions

Byzantine science played an important role in the transmission of classical knowledge to the Islamic world and to Renaissance Italy, and also in the transmission of medieval Arabic knowledge to Renaissance Italy. Its rich historiographical tradition preserved ancient knowledge upon which splendid art, architecture, literature and technological achievements were built.

Byzantine scientists preserved and continued the legacy of the great Ancient Greek mathematicians and put mathematics in practice. In early Byzantium (5th to 7th century) the architects and mathematicians Isidore of Miletus and Anthemius of Tralles used complex mathematical formulas to construct the great “Hagia Sophia” temple, a magnificent technological breakthrough for its time and for centuries afterwards due to its striking geometry, bold design and height. In late Byzantium (9th to 12th century) mathematicians like Michael Psellos considered mathematics as a way to interpret the world.

John Philoponus, a Byzantine scholar in the 500s, was the first person to systematically question Aristotle's teaching of physics. This served as an inspiration for Galileo Galilei ten centuries later as Galileo cited Philoponus substantially in his works when Galileo also argued why Aristotelian physics was flawed during the Scientific Revolution.

Islamic interactions

A Westerner and an Arab learning geometry in the 15th century.

The Byzantine Empire initially provided the medieval Islamic world with Ancient Greek texts on astronomy and mathematics for translation into Arabic. Later with the emerging of the Muslim world, Byzantine scientists such as Gregory Chioniades translated Arabic texts on Islamic astronomy, mathematics and science into Medieval Greek, including the works of Ja'far ibn Muhammad Abu Ma'shar al-Balkhi, Ibn Yunus, al-Khazini, Muhammad ibn Mūsā al-Khwārizmī and Nasīr al-Dīn al-Tūsī among others. There were also some Byzantine scientists who used Arabic transliterations to describe certain scientific concepts instead of the equivalent Ancient Greek terms (such as the use of the Arabic talei instead of the Ancient Greek horoscopus). Byzantine science thus played an important role in not only transmitting ancient Greek knowledge to Western Europe and the Islamic world, but in also transmitting Islamic knowledge to Western Europe. Byzantine scientists also became acquainted with Sassanid and Indian astronomy through citations in some Arabic works.

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Copper

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