In early Egyptian and Mesopotamian thought, the world was portrayed as a disk floating in the ocean. A similar model is found in the Homeric account from the 8th century BC in which "Okeanos, the personified body of water surrounding the circular surface of the Earth, is the begetter of all life and possibly of all gods."
The Israelites also imagined the Earth to be a disc floating on water with an arched firmament above it that separated the Earth from the heavens. The sky was a solid dome with the Sun, Moon, planets, and stars embedded in it.
Homer's description of the disc cosmography on the shield of Achilles with the encircling ocean is repeated far later in Quintus Smyrnaeus' Posthomerica (4th century AD), which continues the narration of the Trojan War.
Thales thought that the Earth floated in water like a log. It has been argued, however, that Thales actually believed in a round Earth.Anaximander (c. 550 BC) believed that the Earth was a short cylinder with a flat, circular top that remained stable because it was the same distance from all things.Anaximenes of Miletus believed that "the Earth is flat and rides on air; in the same way the Sun and the Moon and the other heavenly bodies, which are all fiery, ride the air because of their flatness".Xenophanes of Colophon (c. 500 BC) thought that the Earth was flat, with its upper side touching the air, and the lower side extending without limit.
Belief in a flat Earth continued into the 5th century BC. Anaxagoras (c. 450 BC) agreed that the Earth was flat, and his pupil Archelaus believed that the flat Earth was depressed in the middle like a saucer, to allow for the fact that the Sun does not rise and set at the same time for everyone.
Hecataeus of Miletus believed that the Earth was flat and surrounded by water.Herodotus in his Histories ridiculed the belief that water encircled the world, yet most classicists agree that he still believed Earth was flat because of his descriptions of literal "ends" or "edges" of the Earth.
The ancient Norse and Germanic peoples believed in a flat Earth cosmography with the Earth surrounded by an ocean, with the axis mundi, a world tree (Yggdrasil), or pillar (Irminsul) in the centre. In the world-encircling ocean sat a snake called Jormungandr. The Norse creation account preserved in Gylfaginning (VIII) states that during the creation of the Earth, an impassable sea was placed around it:
And Jafnhárr said: "Of the blood, which ran and welled forth freely out of his wounds, they made the sea, when they had formed and made firm the Earth together, and laid the sea in a ring round. about her; and it may well seem a hard thing to most men to cross over it."
If you take a lighted candle and set it in a room, you may expect it to light up the entire interior, unless something should hinder, though the room be quite large. But if you take an apple and hang it close to the flame, so near that it is heated, the apple will darken nearly half the room or even more. However, if you hang the apple near the wall, it will not get hot; the candle will light up the whole house; and the shadow on the wall where the apple hangs will be scarcely half as large as the apple itself. From this you may infer that the Earth-circle is round like a ball and not equally near the sun at every point. But where the curved surface lies nearest the sun's path, there will the greatest heat be; and some of the lands that lie continuously under the unbroken rays cannot be inhabited.
In ancient China, the prevailing belief was that the Earth was flat and square, while the heavens were round, an assumption virtually unquestioned until the introduction of European astronomy in the 17th century. The English sinologist Cullen emphasizes the point that there was no concept of a round Earth in ancient Chinese astronomy:
Chinese thought on the form of the Earth remained almost unchanged from early times until the first contacts with modern science through the medium of Jesuit missionaries in the seventeenth century. While the heavens were variously described as being like an umbrella covering the Earth (the Kai Tian theory), or like a sphere surrounding it (the Hun Tian theory), or as being without substance while the heavenly bodies float freely (the Hsüan yeh theory), the Earth was at all times flat, although perhaps bulging up slightly.
The heavens are like a hen's egg and as round as a crossbow bullet; the Earth is like the yolk of the egg, and lies in the centre.
This analogy with a curved egg led some modern historians, notably Joseph Needham, to conjecture that Chinese astronomers were, after all, aware of the Earth's sphericity. The egg reference, however, was rather meant to clarify the relative position of the flat Earth to the heavens:
In a passage of Zhang Heng's cosmogony not translated by Needham, Zhang himself says: "Heaven takes its body from the Yang, so it is round and in motion. Earth takes its body from the Yin, so it is flat and quiescent". The point of the egg analogy is simply to stress that the Earth is completely enclosed by Heaven, rather than merely covered from above as the Kai Tian describes. Chinese astronomers, many of them brilliant men by any standards, continued to think in flat-Earth terms until the seventeenth century; this surprising fact might be the starting-point for a re-examination of the apparent facility with which the idea of a spherical Earth found acceptance in fifth-century BC Greece.
Further examples cited by Needham supposed to demonstrate dissenting voices from the ancient Chinese consensus actually refer without exception to the Earth being square, not to it being flat. Accordingly, the 13th-century scholar Li Ye, who argued that the movements of the round heaven would be hindered by a square Earth, did not advocate a spherical Earth, but rather that its edge should be rounded off so as to be circular. However, Needham disagrees, affirming that Li Ye believed the Earth to be spherical, similar in shape to the heavens but much smaller. This was preconceived by the 4th-century scholar Yu Xi, who argued for the infinity of outer space surrounding the Earth and that the latter could be either square or round, in accordance to the shape of the heavens. When Chinese geographers of the 17th century, influenced by European cartography and astronomy, showed the Earth as a sphere that could be circumnavigated by sailing around the globe, they did so with formulaic terminology previously used by Zhang Heng to describe the spherical shape of the Sun and Moon (i.e. that they were as round as a crossbow bullet).
As noted in the book Huainanzi, in the 2nd century BC, Chinese astronomers effectively inverted Eratosthenes' calculation of the curvature of the Earth to calculate the height of the Sun above the Earth. By assuming the Earth was flat, they arrived at a distance of (approximately ). The Zhoubi Suanjing also discusses how to determine the distance of the Sun by measuring the length of noontime shadows at different latitudes, a method similar to Eratosthenes' measurement of the circumference of the Earth, but the Zhoubi Suanjing assumes that the Earth is flat.
Lucretius (1st century BC) opposed the concept of a spherical Earth, because he considered that an infinite universe had no center towards which heavy bodies would tend. Thus, he thought the idea of animals walking around topsy-turvy under the Earth was absurd. By the 1st century AD, Pliny the Elder was in a position to claim that everyone agreed on the spherical shape of Earth, though disputes continued regarding the nature of the antipodes, and how it is possible to keep the ocean in a curved shape.
An image of Thorntonbank Wind Farm (near the Belgian coast) with the lower parts of the more distant towers increasingly hidden by the horizon, demonstrating the curvature of the Earth
The Vedic texts depict the cosmos in many ways. One of the earliest Indian cosmological texts picture the Earth as one of a stack of flat disks.
In the Vedic texts, Dyaus (heaven) and Prithvi (Earth) are compared to wheels on an axle, yielding a flat model. They are also described as bowls or leather bags, yielding a concave model. According to Macdonell: "the conception of the Earth being a disc surrounded by an ocean does not appear in the Samhitas. But it was naturally regarded as circular, being compared with a wheel (10.89) and expressly called circular (parimandala) in the Shatapatha Brahmana."
By about the 5th century CE, the siddhanta astronomy texts of South Asia, particularly of Aryabhata, assume a spherical Earth as they develop mathematical methods for quantitative astronomy for calendar and time keeping.
The medieval Indian texts called the Puranas describe the Earth as a flat-bottomed, circular disk with concentric oceans and continents. This general scheme is present not only in the Hindu cosmologies, but also in Buddhist and Jain cosmologies of South Asia. However, some Puranas include other models. For example, the fifth canto of the Bhagavata Purana, includes sections that describe the Earth both as flat and spherical.
Early Christian Church
During the early period of the Christian Church, the spherical view continued to be widely held, with some notable exceptions.Athenagoras, an eastern Christian writing around the year 175 CE, said that the Earth was spherical.Methodius (c. 290 AD), an eastern Christian writing against "the theory of the Chaldeans and the Egyptians" said: "Let us first lay bare ... the theory of the Chaldeans and the Egyptians. They say that the circumference of the universe is likened to the turnings of a well-rounded globe, the Earth being a central point. They say that since its outline is spherical, ... the Earth should be the center of the universe, around which the heaven is whirling."Lactantius, a western Christian writer and advisor to the first Christian Roman Emperor, Constantine, writing sometime between 304-313 CE, ridiculed the notion of antipodes and the philosophers who fancied that "the universe is round like a ball. They also thought that heaven revolves in accordance with the motion of the heavenly bodies. ... For that reason, they constructed brass globes, as though after the figure of the universe."Arnobius, another eastern Christian writing sometime around 305 CE, described the round Earth: "In the first place, indeed, the world itself is neither right nor left. It has neither upper nor lower regions, nor front nor back. For whatever is round and bounded on every side by the circumference of a solid sphere, has no beginning or end ..."
But as to the fable that there are Antipodes, that is to say, men on the opposite side of the Earth, where the sun rises when it sets to us, men who walk with their feet opposite ours that is on no ground credible. And, indeed, it is not affirmed that this has been learned by historical knowledge, but by scientific conjecture, on the ground that the Earth is suspended within the concavity of the sky, and that it has as much room on the one side of it as on the other: hence they say that the part that is beneath must also be inhabited. But they do not remark that, although it be supposed or scientifically demonstrated that the world is of a round and spherical form, yet it does not follow that the other side of the Earth is bare of water; nor even, though it be bare, does it immediately follow that it is peopled. For Scripture, which proves the truth of its historical statements by the accomplishment of its prophecies, gives no false information; and it is too absurd to say, that some men might have taken ship and traversed the whole wide ocean, and crossed from this side of the world to the other, and that thus even the inhabitants of that distant region are descended from that one first man.
Some historians do not view Augustine's scriptural commentaries as endorsing any particular cosmological model, but while the view that Augustine shared the common view of his contemporaries that the Earth is spherical, in line with his endorsement of science in De Genesi ad litteram, is still occasionally challenged, most scholars agree that "Augustine's acceptance of the earth's spherical shape [is] a well-established fact".
Cosmas Indicopleustes' world view - flat Earth in a Tabernacle
Christian Topography (547) by the Alexandrian monk Cosmas Indicopleustes, who had traveled as far as Sri Lanka and the source of the Blue Nile, is now widely considered the most valuable geographical document of the early medieval age, although it received relatively little attention from contemporaries. In it, the author repeatedly expounds the doctrine that the universe consists of only two places, the Earth below the firmament and heaven above it. Carefully drawing on arguments from scripture, he describes the Earth as a rectangle, 400 days' journey long by 200 wide, surrounded by four oceans and enclosed by four massive walls which support the firmament. The spherical Earth theory is contemptuously dismissed as "pagan".
Severian, Bishop of Gabala (d. 408), wrote that the Earth is flat and the Sun does not pass under it in the night, but "travels through the northern parts as if hidden by a wall".Basil of Caesarea (329-379) argued that the matter was theologically irrelevant.
Europe: Early Middle Ages
Early medieval Christian writers in the early Middle Ages felt little urge to assume flatness of the Earth, though they had fuzzy impressions of the writings of Ptolemy and Aristotle, relying more on Pliny.
9th-century Macrobian cosmic diagram showing the sphere of the Earth at the center (globus terrae)
With the end of the Western Roman Empire, Western Europe entered the Middle Ages with great difficulties that affected the continent's intellectual production. Most scientific treatises of classical antiquity (in Greek) were unavailable, leaving only simplified summaries and compilations. In contrast, the Eastern Roman Empire did not fall, and it preserved the learning. Still, many textbooks of the Early Middle Ages supported the sphericity of the Earth in the western part of Europe.
Bishop Isidore of Seville (560-636) taught in his widely read encyclopedia, the Etymologies, diverse views such as that the Earth "resembles a wheel" resembling Anaximander in language and the map that he provided. This was widely interpreted as referring to a disc-shaped Earth. An illustration from Isidore's De Natura Rerum shows the five zones of the Earth as adjacent circles. Some have concluded that he thought the Arctic and Antarctic zones were adjacent to each other. He did not admit the possibility of antipodes, which he took to mean people dwelling on the opposite side of the Earth, considering them legendary and noting that there was no evidence for their existence. Isidore's T and O map, which was seen as representing a small part of a spherical Earth, continued to be used by authors through the Middle Ages, e.g. the 9th-century bishop Rabanus Maurus, who compared the habitable part of the northern hemisphere (Aristotle's northern temperate clime) with a wheel. At the same time, Isidore's works also gave the views of sphericity, for example, in chapter 28 of De Natura Rerum, Isidore claims that the Sun orbits the Earth and illuminates the other side when it is night on this side. See French translation of De Natura Rerum. In his other work Etymologies, there are also affirmations that the sphere of the sky has Earth in its center and the sky being equally distant on all sides. Other researchers have argued these points as well. "The work remained unsurpassed until the thirteenth century and was regarded as the summit of all knowledge. It became an essential part of European medieval culture. Soon after the invention of typography it appeared many times in print." However, "The Scholastics - later medieval philosophers, theologians, and scientists - were helped by the Arabic translators and commentaries, but they hardly needed to struggle against a flat-Earth legacy from the early middle ages (500-1050). Early medieval writers often had fuzzy and imprecise impressions of both Ptolemy and Aristotle and relied more on Pliny, but they felt (with one exception), little urge to assume flatness."
Isidore's portrayal of the five zones of the Earth
St Vergilius of Salzburg (c. 700-784), in the middle of the 8th century, discussed or taught some geographical or cosmographical ideas that St Boniface found sufficiently objectionable that he complained about them to Pope Zachary. The only surviving record of the incident is contained in Zachary's reply, dated 748, where he wrote:
As for the perverse and sinful doctrine which he (Virgil) against God and his own soul has uttered - if it shall be clearly established that he professes belief in another world and other men existing beneath the Earth, or in (another) sun and moon there, thou art to hold a council, deprive him of his sacerdotal rank, and expel him from the Church.
Some authorities have suggested that the sphericity of the Earth was among the aspects of Vergilius's teachings that Boniface and Zachary considered objectionable. Others have considered this unlikely, and take the wording of Zachary's response to indicate at most an objection to belief in the existence of humans living in the antipodes. In any case, there is no record of any further action having been taken against Vergilius. He was later appointed bishop of Salzburg and was canonised in the 13th century.
12th-century depiction of a spherical Earth with the four seasons (book Liber Divinorum Operum by Hildegard of Bingen)
A possible non-literary but graphic indication that people in the Middle Ages believed that the Earth (or perhaps the world) was a sphere is the use of the orb (globus cruciger) in the regalia of many kingdoms and of the Holy Roman Empire. It is attested from the time of the Christian late-Roman emperor Theodosius II (423) throughout the Middle Ages; the Reichsapfel was used in 1191 at the coronation of emperor Henry VI. However the word orbis means "circle", and there is no record of a globe as a representation of the Earth since ancient times in the west until that of Martin Behaim in 1492. Additionally it could well be a representation of the entire "world" or cosmos.
A recent study of medieval concepts of the sphericity of the Earth noted that "since the eighth century, no cosmographer worthy of note has called into question the sphericity of the Earth". However, the work of these intellectuals may not have had significant influence on public opinion, and it is difficult to tell what the wider population may have thought of the shape of the Earth, if they considered the question at all.
Hermannus Contractus (1013-1054) was among the earliest Christian scholars to estimate the circumference of Earth with Eratosthenes' method. St. Thomas Aquinas (1225-1274), the most widely taught theologian of the Middle Ages, believed in a spherical Earth and took for granted that his readers also knew the Earth is round. Lectures in the medieval universities commonly advanced evidence in favor of the idea that the Earth was a sphere.
Tattersall shows that in many vernacular works in 12th- and 13th-century French texts the Earth was considered "round like a table" rather than "round like an apple". "In virtually all the examples quoted ... from epics and from non-'historical' romances (that is, works of a less learned character) the actual form of words used suggests strongly a circle rather than a sphere", though he notes that even in these works the language is ambiguous.[verify]
Portuguese navigation down and around the coast of Africa in the latter half of the 1400s gave wide-scale observational evidence for Earth's sphericity. In these explorations, the Sun position moved more northward the further south the explorers travelled. Its position directly overhead at noon gave evidence for crossing the equator. These apparent solar motions in detail were more consistent with north-south curvature and a distant Sun, than with any flat-Earth explanation. The ultimate demonstration came when Ferdinand Magellan's expedition completed the first global circumnavigation in 1521. Antonio Pigafetta, one of the few survivors of the voyage, recorded the loss of a day in the course of the voyage, giving evidence for east-west curvature.
The Quran mentions that the Earth (al-ar?) was "spread out". Prior to the introduction of Greek cosmology into the Islamic world, early Muslims tended to also view the Earth as flat, and Muslim traditionalists who rejected Greek philosophy continued to hold to this view later on while various theologians held different opinions. For example, a tafsir on Qur'an 13:3 saying that God stretched out the Earth was commented on by Al-Mawardi as being written "in response to those who claim that it is round like a ball". The same argument against a spherical Earth was made in a tafsir by Al-Qurtubi in the 13th century. Later still, Tafsir al-Jalalayn in the 15th century stated that the Earth is flat in his commentary on Quran 88:20, which he said was the opinion of the scholars of the law.
Beginning in the 10th century onwards, some Muslim traditionalists began to adopt the notion of a spherical Earth. For example, regarding the Qur'anic statements about the Earth spreading, the 12th-century commentary, the Tafsir al-Kabir (al-Razi) by Fakhr al-Din al-Razi states: "If it is said: Do the words 'And the Earth We spread out' indicate that it is flat? We would respond: Yes, because the Earth, even though it is round, is an enormous sphere, and each little part of this enormous sphere, when it is looked at, appears to be flat. As that is the case, this will dispel what they mentioned of confusion. The evidence for that is the verse in which Allah says (interpretation of the meaning): 'And the mountains as pegs' [an-Naba' 78:7]. He called them awtaad (pegs) even though these mountains may have large flat surfaces. And the same is true in this case." In the 11th century, Ibn Hazm claimed that "Evidence shows that the Earth is a sphere but public people say the opposite." He added: "None of those who deserve being Imams for Muslims has denied that Earth is round. And we have not received anything indicates a denial, not even a single word."
Ming Dynasty in China
A spherical terrestrial globe was introduced to Yuan-eraKhanbaliq (i.e. Beijing) in 1267 by the Persian astronomer Jamal ad-Din, but it is not known to have made an impact on the traditional Chinese conception of the shape of the Earth. As late as 1595, an early Jesuit missionary to China, Matteo Ricci, recorded that the Ming-dynasty Chinese say: "The Earth is flat and square, and the sky is a round canopy; they did not succeed in conceiving the possibility of the antipodes."
In the 17th century, the idea of a spherical Earth spread in China due to the influence of the Jesuits, who held high positions as astronomers at the imperial court. Matteo Ricci, in collaboration with Chinese cartographers and translator Li Zhizao, published the Kunyu Wanguo Quantu in 1602, the first Chinese world map based on European discoveries. The astronomical and geographical treatise Gezhicao () written in 1648 by Xiong Mingyu () explained that the Earth was spherical, not flat or square, and could be circumnavigated.
Myth of flat-Earth prevalence
Beginning in the 19th century, a historical myth arose which held that the predominant cosmological doctrine during the Middle Ages was that the Earth was flat. An early proponent of this myth was the American writer Washington Irving, who maintained that Christopher Columbus had to overcome the opposition of churchmen to gain sponsorship for his voyage of exploration. Later significant advocates of this view were John William Draper and Andrew Dickson White, who used it as a major element in their advocacy of the thesis that there was a long-lasting and essential conflict between science and religion. Some studies of the historical connections between science and religion have demonstrated that theories of their mutual antagonism ignore examples of their mutual support.
Subsequent studies of medieval science have shown that most scholars in the Middle Ages, including those read by Christopher Columbus, maintained that the Earth was spherical.
In the modern era, the pseudoscientific belief in a flat Earth has been expressed by a variety of individuals and groups:
English writer Samuel Rowbotham (1816-1885), writing under the pseudonym "Parallax", produced in 1849 a pamphlet "Zetetic Astronomy" arguing for a flat Earth and published results of many experiments that tested the curvatures of water over a long-drainage ditch, followed by another, called The inconsistency of Modern Astronomy and its Opposition to the Scripture. One of his supporters, John Hampden, lost a bet to Alfred Russel Wallace in the famous Bedford Level experiment, which attempted to prove it. In 1877, Hampden produced a book A New Manual of Biblical Cosmography. Rowbotham also produced studies that purported to show that the effects of ships disappearing below the horizon could be explained by the laws of perspective in relation to the human eye. In 1883, he founded Zetetic Societies in England and New York, to which he shipped a thousand copies of Zetetic Astronomy.
William Carpenter, a printer originally from Greenwich, was a supporter of Rowbotham. Carpenter published Theoretical Astronomy Examined and Exposed - Proving the Earth not a Globe in eight parts from 1864 under the name Common Sense. He later emigrated to Baltimore, where he published One Hundred Proofs the Earth is Not a Globe in 1885. He wrote: "There are rivers that flow for hundreds of miles towards the level of the sea without falling more than a few feet - notably, the Nile, which, in a thousand miles, falls but a foot. A level expanse of this extent is quite incompatible with the idea of the Earth's convexity. It is, therefore, a reasonable proof that Earth is not a globe", as well as: "If the Earth were a globe, a small model globe would be the very best - because the truest - thing for the navigator to take to sea with him. But such a thing as that is not known: with such a toy as a guide, the mariner would wreck his ship, of a certainty! This is a proof that Earth is not a globe."
John Jasper, an American slave turned prolific preacher, and friend of Carpenter's, echoed his friend's sentiments in his most famous sermon "The Sun do move", preached over 250 times, always by invitation. In a written account of his sermon, published in The Richmond Whig of March 19, 1878, Jasper says he would frequently cite the verse "I saw four angels standing on the four corners of the earth" and follow up by arguing: "So we are living on a four-cornered earth; then, my friends, will you tell me how in the name of God can an earth with four corners be round!" In the same article he argued: "if the earth is like others say, who hold a different theory, peopled on the other side, those people would be obliged to walk on the ground with their feet upward like flies on the ceiling of a room".
In Brockport, New York, in 1887, M. C. Flanders argued the case of a flat Earth for three nights against two scientific gentlemen defending sphericity. Five townsmen chosen as judges voted unanimously for a flat Earth at the end. The case was reported in the Brockport Democrat.
After Rowbotham's death, Lady Elizabeth Blount (Elizabeth de Sodington Blount, née Elizabeth Anne Mould Williams) created the Universal Zetetic Society in 1893 in England and created a journal called Earth not a Globe Review, which sold for twopence, as well as one called Earth, which only lasted from 1901 to 1904. She held that the Bible was the unquestionable authority on the natural world and argued that one could not be a Christian and believe the Earth is a globe. Well-known members included E. W. Bullinger of the Trinitarian Bible Society, Edward Haughton, senior moderator in natural science in Trinity College, Dublin and an archbishop. She repeated Rowbotham's experiments, generating some counter-experiments, but interest declined after the First World War. The movement gave rise to several books that argued for a flat, stationary Earth, including Terra Firma by David Wardlaw Scott.
From 1915 to 1942 Wilbur Glenn Voliva, who in 1906 took over the Christian Catholic Church, a Pentecostal sect that established a utopian community in Zion, Illinois, preached flat Earth doctrine. He used a photograph of a twelve-mile (19 km) stretch of the shoreline at Lake Winnebago, Wisconsin, taken three feet (91 cm) above the waterline to prove his point. When the airship Italia disappeared on an expedition to the North Pole in 1928, he warned the world's press that it had sailed over the edge of the world. He offered a $5000 award for proving that the Earth is not flat, under his own conditions. Teaching a globular Earth was banned in the Zion schools, and the message was transmitted on his WCBD radio station.
In 1956, Samuel Shenton set up the International Flat Earth Research Society (IFERS), better known as the Flat Earth Society from Dover, UK, as a direct descendant of the Universal Zetetic Society.
In 2018, astronomer Yaël Nazé analyzed the controversy over a Ph.D. dissertation proposed by a student at the University of Sfax in Tunisia, which defended a flat Earth, as well as a geocentric model of the solar system and a young Earth. The dissertation, which had not been approved by the committee overseeing environmental studies theses, had been made public and denounced in 2017 by Hafedh Ateb, a founder of the Tunisian Astronomical Society on his Facebook page.
His primary aim was to reach children before they were convinced about a spherical Earth. Despite plenty of publicity, the space race eroded Shenton's support in Britain until 1967, when he started to become famous due to the Apollo program.
In 1972, Shenton's role was taken over by Charles K. Johnson, a correspondent from California, US. He incorporated the IFERS and steadily built it up to about 3000 members. He spent years examining the studies of flat- and round-Earth theories and proposed evidence of a conspiracy against flat Earth: "The idea of a spinning globe is only a conspiracy of error that Moses, Columbus, and FDR all fought..." His article was published in the magazine Science Digest in 1980. It goes on to state: "If it is a sphere, the surface of a large body of water must be curved. The Johnsons have checked the surfaces of Lake Tahoe and the Salton Sea without detecting any curvature."
The Society declined in the 1990s following a fire at its headquarters in California, and Johnson died in 2001. It was revived as a website in 2004 by Daniel Shenton (no relation to Samuel Shenton). He believes that no one has provided proof that the world is not flat.
In the Internet era, the proliferation of communications technology and social-media platforms such as YouTube,Facebook and Twitter have given individuals, famous or otherwise, a platform to spread pseudo-scientific ideas and build stronger followings. The flat-Earth conjecture has flourished in this environment. Social media and the internet, furthermore, have made it easier for like-minded theorists to connect with one another and mutually reinforce their beliefs. In other words, social media has had a "levelling effect", in that experts have less sway in the public mind than they used to.
YouTube had faced criticism for allowing the spread of misinformation and conspiracy theories through its platform. In 2019, YouTube stated that it was making changes in its software to reduce the distribution of videos based on conspiracy theories including flat Earth.
Members of the Flat Earth Society and other flat-Earthers claim that NASA and other government agencies conspire to fabricate evidence that the Earth is spherical. According to the most widely spread version of current flat-Earth theory, NASA is guarding the Antarctic ice wall that surrounds Earth. Flat-Earthers argue that NASA photoshops its satellite images, based on observations that the color of the oceans changes from image to image and that continents seem to be in different places. The publicly perpetuated image is kept up through a large-scale practice of "compartmentalization", according to which only a select number of individuals have knowledge about the truth.
The term flat-earth-man, used in a derogatory sense to mean anyone who holds ridiculously antiquated or impossible views, predates the more compact flat-earther. It was recorded in 1908: "Fewer votes than one would have thought possible for any human candidate, were he even a flat-earth-man." According to the Oxford English Dictionaryflat-Earther's first use is in 1934 in Punch magazine: "Without being a bigoted flat-earther, [Mercator] perceived the nuisance ... of fiddling about with globes ... in order to discover the South Seas."
^Direct adoption of the Greek concept by Islam: Ragep, F. Jamil: "Astronomy", in: Krämer, Gudrun (ed.) et al.: Encyclopaedia of Islam, THREE, Brill 2010, without page numbers.
^Direct adoption by India: D. Pingree: "History of Mathematical Astronomy in India", Dictionary of Scientific Biography, Vol. 15 (1978), pp. 533-633 (554ff.); Glick, Thomas F., Livesey, Steven John, Wallis, Faith (eds.): "Medieval Science, Technology, and Medicine: An Encyclopedia", Routledge, New York 2005, ISBN0-415-96930-1, p. 463.
^Pyramid Texts, Utterance 366, 629a-29c: "Behold, thou art great and round like the Great Round; Behold, thou are bent around, and art round like the Circle which encircles the nbwt; Behold, thou art round and great like the Great Circle which sets."(Faulkner 1969, 120)
^Ancient Near Eastern Texts, Pritchard, 1969, p. 374.
^The Shield of Heracles, 314-16, transl. Hugh G. Evelyn-White, 1914.
^The shield of Achilles and the poetics of ekphrasis, Andrew Sprague Becker, Rowman & Littlefield, 1995, p. 148.
^Professor of Classics (Emeritus) Mark W. Edwards in his The Iliad. A commentary (1991, p. 231) has noted of Homer's usage of the flat Earth disc in the Iliad: "Okeanos...surrounds the pictures on the shield and he surrounds the disc of the Earth on which men and women work out their lives". Quoted in The shield of Achilles and the poetics of ekphrasis, Andrew Sprague Becker, Rowman & Littlefield, 1995, p. 148
^Stasinus of Cyprus wrote in his Cypria (lost, only preserved in fragment) that Oceanus surrounded the entire Earth: deep eddying Oceanus and that the Earth was flat with furthest bounds, these quotes are found preserved in Athenaeus, Deipnosophistae, VIII. 334B.
^Mimnermus of Colophon (630BC) details a flat Earth model, with the sun (Helios) bathing at the edges of Oceanus that surround the Earth (Mimnermus, frg. 11)
^Seven against Thebes, verse 305; Prometheus Bound, 1, 136; 530; 665 (which also describe the 'edges' of the Earth).
^Apollonius Rhodius, in his Argonautica (3rd century BC) included numerous flat Earth references (IV. 590 ff): "Now that river, rising from the ends of the Earth, where are the portals and mansions of Nyx (Night), on one side bursts forth upon the beach of Okeanos."
^Posthomerica (V. 14). "Here [on the shield of Achilles] Tethys' all-embracing arms were wrought, and Okeanos fathomless flow. The outrushing flood of Rivers crying to the echoing hills all round, to right, to left, rolled o'er the land." Translation by Way, A.S. 1913.
^According to John Mansley Robinson, An Introduction to Early Greek Philosophy, Houghton and Mifflin, 1968.
^Herodotus knew of the conventional view, according to which the river Ocean runs around a circular flat Earth (4.8), and of the division of the world into three - Jacoby, RE Suppl. 2.352 ff, yet rejected this personal belief (Histories, 2. 21; 4. 8; 4. 36).
^The history of Herodotus, George Rawlinson, Appleton and company, 1889, p. 409.
^The Sacred Tree in Religion and Myth, Mrs. J. H. Philpot, Courier Dover Publications, 2004, p. 113.
^"The world was a flat disk, with the Earth in the center and the sea all around. Thus the serpent is about as far away from the center, where men and gods lived" (Norse mythology: a guide to the Gods, heroes, rituals, and beliefs, John Lindow, Oxford University Press, 2002) p. 253.
^One of the earliest literary references to the world encircling water snake comes from Bragi Boddason who lived in the 9th century, in his Ragnarsdrápa (XIV).
^Cullen, Christopher (1976). "A Chinese Eratosthenes of the Flat Earth: A Study of a Fragment of Cosmology in Huai Nan tzu ? ? ?". Bulletin of the School of Oriental and African Studies. 39 (1): 106-27 [pp. 107-09]. doi:10.1017/S0041977X00052137.
^Cullen, Christopher (1976). "A Chinese Eratosthenes of the Flat Earth: A Study of a Fragment of Cosmology in Huai Nan tzu ? ? ?". Bulletin of the School of Oriental and African Studies. 39 (1): 106-27 [p. 107]. doi:10.1017/S0041977X00052137.
^Cullen, Christopher (1976). "A Chinese Eratosthenes of the Flat Earth: A Study of a Fragment of Cosmology in Huai Nan tzu ? ? ?". Bulletin of the School of Oriental and African Studies. 39 (1): 106-27 [p. 108]. doi:10.1017/S0041977X00052137.
^ abCullen, Christopher (1976). "A Chinese Eratosthenes of the Flat Earth: A Study of a Fragment of Cosmology in Huai Nan tzu ? ? ?". Bulletin of the School of Oriental and African Studies. 39 (1): 106-27 [p. 109]. doi:10.1017/S0041977X00052137.
^Needham, Joseph; Wang, Ling. (1995) . Science and Civilization in China: Mathematics and the Sciences of the Heavens and the Earth, vol. 3, reprint edition. Cambridge: Cambridge University Press. ISBN0-521-05801-5, p. 498.
^Needham, Joseph; Wang, Ling. (1995) . Science and Civilization in China: Mathematics and the Sciences of the Heavens and the Earth, vol. 3, reprint edition. Cambridge: Cambridge University Press. ISBN0-521-05801-5, pp. 220, 498.
^Needham, Joseph; Wang, Ling. (1995) . Science and Civilization in China: Mathematics and the Sciences of the Heavens and the Earth, vol. 3, reprint edition. Cambridge: Cambridge University Press. ISBN0-521-05801-5, pp. 227, 499.
^D. Pingree: "History of Mathematical Astronomy in India", Dictionary of Scientific Biography, Vol. 15 (1978), pp. 533-633 (554ff.), Quote: "In the Pur?nas, the Earth is a flat-bottomed, circular disk, in the center of which is a lofty mountain, Meru. Surrounding Meru is the circular continent Jamb?dv?pa, which is in turn surrounded by a ring of water known as the Salt Ocean. There follow alternating rings of land and sea until there are seven continents and seven oceans. In the southern quarter of Jamb?dv?pa lies India-Bh?ratavarsa."
^name=Ferrari>Leo Ferrari, "Rethinking Augustine's Confessions, Thirty Years of Discoveries", Religious Studies and Theology (2000).
^Nothaft, C. P. E. (2011), "Augustine and the Shape of the Earth: A Critique of Leo Ferrari", Augustinian Studies, 42 (1): 35, doi:10.5840/augstudies20114213
^J. L. E. Dreyer, A History of Planetary Systems from Thales to Kepler. (1906); unabridged republication as A History of Astronomy from Thales to Kepler (New York: Dover Publications, 1953).
^St. John Chrysostom, Homilies Concerning the Statues, Homily IX, paras. 7-8, in A Select Library of the Nicene and Post-Nicene Fathers of the Christian Church, Series I, Vol IX, ed. Philip Schaff, American reprint of the Edinburgh edition (1978), Wm. B. Eerdmans Publishing Co., Grand Rapids, MI, p. 403:
"When therefore thou beholdest not a small pebble, but the whole earth borne upon the waters, and not submerged, admire the power of Him who wrought these marvellous things in a supernatural manner! And whence does this appear, that the earth is borne upon the waters? The prophet declares this when he says, 'He hath founded it upon the seas, and prepared it upon the floods.' And again: 'To him who hath founded the earth upon the waters.' What sayest thou? The water is not able to support a small pebble on its surface, and yet bears up the earth, great as it is; and mountains, and hills, and cities, and plants, and men, and brutes; and it is not submerged!"
^St. Athanasius, Against the Heathen, Ch. 27, Ch. 36, in A Select Library of the Nicene and Post-Nicene Fathers of the Christian Church, Series II, Vol IV, ed. Philip Schaff, American reprint of the Edinburgh edition (1978), Wm. B. Eerdmans Publishing Co., Grand Rapids, MI.
^Lindberg, David. (1992) The Beginnings of Western Science. University of Chicago Press. Page 363.
^B. Eastwood and G. Graßhoff, Planetary Diagrams for Roman Astronomy in Medieval Europe, ca. 800-1500, Transactions of the American Philosophical Society, 94, 3 (Philadelphia, 2004), pp. 49-50.
Stephen A. Barney, W. J. Lewis, J. A. Beach, Oliver Berghof (translators) (2010). "XIV ii 1". The Etymologies of Isidore of Seville. Cambridge University Press. ISBN978-0-521-83749-1.CS1 maint: multiple names: authors list (link)
^Wesley M. Stevens, "The Figure of the Earth in Isidore's De natura rerum", Isis, 71 (1980): 268-77. Stevens, Wesley M. (1980). "The Figure of the Earth in Isidore's "De natura rerum"". Isis. 71 (2): 268-77. doi:10.1086/352464. JSTOR230175. S2CID133430429, page 274CS1 maint: postscript (link)
^Grant, Edward (1974). A Sourcebook in Medieval Science (Source Books in the History of the Sciences). Harvard University Press. ISBN978-0-674-82360-0.
^Thomas Glick; Stephen John Livesley; Faith Wallis (2005). Medieval Science Technology and Medicine, an Encyclopedia. NY: Taylor & Francis.
^English translation by Laistner, M. L. W. (1966) . "Thought and Letters in Western Europe: A.D. 500 to 900" (2nd ed.). Ithaca, NY: Cornell University Press: 184-185. Cite journal requires |journal= (help) The original Latin reads: De perversa autem et iniqua doctrina, quae contra Deum et animam suam locutus est, si clarificatum fuerit ita eum confiteri, quod alius mundus et alii homines sub terra seu sol et luna, hunc habito concilio ab ?cclesia pelle sacerdotii honore privatum. (MGH, 1, 80, pp. 178-79).
^Ash-Shareef, Abdurrahim Khairullah Omar (15 November 2014). "Aspects of Ancient Muslim Scholars' Induction Drawn from the Holy Qur'an in Proving Earth is Spherical". Journal of Education and Practice. 5: 210-218. CiteSeerX10.1.1.832.9945.
^Lindberg, David C. (2000), "Science and the Early Christian Church", in Shank, Michael H. (ed.), The Scientific Enterprise in Antiquity and the Middle Ages: Readings from Isis, Chicago and London: University of Chicago Press, pp. 125-146, ISBN978-0-226-74951-8
^Ferngren, Gary, ed. (2002), "Introduction", Science & Religion: A Historical Introduction, Baltimore: Johns Hopkins University Press, p. ix, ISBN978-0-8018-7038-5
^The Earth: Scripturally, Rationally, and Practically Described. A Geographical, Philosophical, and Educational Review, Nautical Guide, and General Student's Manual, n. 17 (November 1, 1887), p. 7. Cited in Schadewald, Robert J. (1981). "Scientific Creationism, Geocentricity, and the Flat Earth". Skeptical Inquirer. Lock Haven University. Retrieved 2010 – via lhup.edu.
^Gallagher, Eugene V. (2006). Introduction to New and Alternative Religions in America [Five Volumes]. Greenwood Publishing Group. p. 73. ISBN978-0-313-05078-7. ...he accepted the collection of Jewish law known as the Talmud as the ultimate authority on religious matters. Like many black Israelites and black Muslims, Cherry stigmatized Southern black culture, forbidding his followers to eat pork, drink heavily, or observe Christian holidays. He also separated himself from African American Christianity by forbidding pianos, public collections, emotional expression in worship, or speaking in tongues. ... Services began and ended with a prayer said while facing east ... Prophet Cherry's theology was strongly millenarian, black nationalist, and idiosyncratic. He emphasized strict adherence to the Ten Commandments, and his followers believed in a square Earth surrounded by three layers of heaven. He claimed that Jesus was black and would return in the year 2000 and raise all the saints who obeyed the Ten Commandments and the teachings of Prophet Cherry. Cherry denigrated white Jews as interlopers and frauds and vilified them for denying the divinity of Jesus. Prophet Cherry passed away in 1963 and was succeeded by his son Prince Benjamin F. Cherry.
^Nazé, Yaël (2018). "A Doctoral Dissertation on a Geocentric Flat Earth: 'Zetetic' Astronomy at the University Level". Skeptical Inquirer. 42 (3): 12-14.
^Schadewald, Robert J. "The Flat-out Truth:Earth Orbits? Moon Landings? A Fraud! Says This Prophet", Science Digest, July 1980.
^Schick, Theodore; Lewis Vaughn, How to think about weird things: critical thinking for a new age, Houghton Mifflin (Mayfield) (October 31, 1995), ISBN978-1-55934-254-4, p. 197.
Fraser, Raymond (2007). When The Earth Was Flat: Remembering Leonard Cohen, Alden Nowlan, the Flat Earth Society, the King James monarchy hoax, the Montreal Story Tellers and other curious matters. Black Moss Press, ISBN978-0-88753-439-3