People from early antiquity generally believed the world was flat, but by the time of Pliny the Elder (1st century) its spherical shape was generally acknowledged. Ptolemy derived his maps from a curved globe and developed the system of latitude and longitude.
Between the fall of the Roman Empire and the renaissance of science several centuries later, some Christian writers questioned and even opposed Earth's sphericity, although it is not clearly known how influential their views were. Even before the Renaissance began, the flat Earth theory had almost died out, yielding by the 900s or 1100s to the idea that Earth is a globe.
Some Christians in England and America tried to revive Flat Earth thinking in the 19th century, and a few hold out to this day (see Flat Earth Society).
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Belief in a flat Earth is found in humankind's oldest writings. In early Mesopotamian thought the world was portrayed as a flat disk floating in the ocean, and this forms the premise for early Greek maps like those of Anaximander and Hecataeus.
By classical times an alternate idea, that Earth was spherical, had appeared. This was espoused by Pythagoras apparently on aesthetic grounds, as he also held all other celestial bodies to be spherical. Aristotle provided physical evidence for the spherical Earth:
Antiquity
Earth's circumference was estimated around 240 BC by Eratosthenes, who heard about a place in Egypt where the sun was directly overhead at the summer solstice and used geometry to come up with a circumference of 250,000 stades. This estimate astonishes some modern writers, as it is within 2% of the modern value of 40,070 kilometers.
One popular belief is that, after the downfall of the Roman Empire, the knowledge of the spherical Earth was lost, and people believed in a flat Earth again. The extent to which this is true is disputed.
It is certain that several Christian writers explicitly argued against the spherical Earth. Lactantius (245-325) calls it "folly" because people on a sphere would fall down; Saint Cyril of Jerusalem (315-386) saw Earth as a firmament floating on water; Saint John Chrysostom (344-408) saw a spherical Earth as contradictory to scripture; Severian, Bishop of Gabala (d. 408) and Diodorus of Tarsus (d. 394) argued for a flat Earth; and Cosmas Indicopleustes (547) called Earth "a parallelogram, flat, and surrounded by four seas" in his Christian Topography. There are relatively few historical records of the period between 600 and 1000 for either spherical or flat-Earth thinking. Saint Basil (329-379) argued that knowledge about Earth's shape was irrelevant.
It is unclear how influential these writers were. Different historians have argued either for very high (e.g. Andrew Dickson White) or very low (e.g. Jeffrey Russell) influence. Russell, a Christian scholar at Santa Barbara whose main contribution to historical scholarship is a series of books on the history of concepts of evil and ideas of Satan, explored the issue in Inventing the Flat Earth: Columbus and Modern Historians. Russell claims that the Flat Earth theory is a myth used to impugn pre-modern civilization, especially that of the Middle Ages in Europe.
One critical part of this dispute is the belief in antipodes, that is, people living on the opposite side of Earth, with their feet faced against ours. Even some of the most important medieval scholars like Saint Augustine (354-430) argued against antipodes and called them a "fable". However, Augustine explicitly pointed out that the belief in a spherical Earth did not directly imply a belief in antipodes:
Middle Ages
The phrase "even should it be believed or demonstrated that the world is round" indicates that this was certainly not the consensus of the time, and possibly not even believed by Augustine. This is in clear contrast to the pre-Christian period. Procopius of Gaza (491-518) argued that "if there be men on the other side of the Earth, Christ must have gone there and suffered a second time to save them; and therefore there must have been, as necessary preliminaries to his coming, a duplicate Adam, Eden, serpent, and Deluge!" Saint Boniface (d. 755) accused Vergilius (d. 784) of "teaching a doctrine in regard to the rotundity of the Earth, which was 'contrary to the Scriptures'." (Catholic Encyclopedia). Pope Zacharias decided that "if it be proved that he held the said doctrine, a council be held, and Vergilius expelled from the Church and deprived of his priestly dignity." Vergilius believed "that beneath the Earth there was another world and other men, another Sun and Moon."
The primitive level of medieval cartography also makes it difficult to estimate the degree of flat-Earth thinking. The question whether average people in the Middle Ages believed in a flat Earth may yet be completely separate from the surviving manuscripts, given the low literacy of the time and the fact that it was probably the priests in the churches, not the few noted theologians, who defined public opinion on the matter.
Modern people who do not accept the spherical Earth and base this opinion on Scripture do not represent a continuing school of Biblical exegesis, although some small groups work hard to keep the concept alive.
The Earth is very smooth, which is to say, locally flat. Much smoother than, for example, a billiard ball which if it were the size of Earth would have mountains 50 miles high.
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