Concept

Flat Earth

Overview

Flat Earth is an archaic and scientifically disproven conception of the Earth's shape as a plane or disk. Many ancient societies subscribed to a flat-Earth cosmography. The model has undergone a recent resurgence as a conspiracy theory in the 21st century.

The idea of a spherical Earth appeared in ancient Greek philosophy with Pythagoras (6th century BC). However, the early Greek cosmological view of a flat Earth persisted among most pre-Socratics (6th–5th century BC). In the early 4th century BC, Plato wrote about a spherical Earth. By about 330 BC, his former student Aristotle had provided strong empirical evidence for a spherical Earth. Knowledge of the Earth's global shape gradually began to spread beyond the Hellenistic world. By the early period of the Christian Church, the spherical view was widely held, with some notable exceptions. In contrast, ancient Chinese scholars consistently describe the Earth as flat, and this perception remained unchanged until their encounters with Jesuit missionaries in the 17th century. Muslim scholars in early Islam maintained that the Earth is flat. However, since the 9th century, Muslim scholars have tended to believe in a spherical Earth.

It is a historical myth that medieval Europeans generally thought the Earth was flat. This myth was created in the 17th century by Protestants to argue against Catholic teachings, and gained currency in the 19th century.

Despite the scientific facts and obvious effects of Earth's sphericity, pseudoscientific flat-Earth conspiracy theories persist. Since the 2010s, belief in a flat Earth has increased, both as membership of modern flat Earth societies, and as unaffiliated individuals using social media. In a 2018 study reported on by Scientific American, only 82% of 18- to 24-year-old American respondents agreed with the statement "I have always believed the world is round". However, a firm belief in a flat Earth is rare, with less than 2% acceptance in all age groups.

Overview adapted from Wikipedia (CC BY-SA 4.0; see the article history for authors).

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Plato, that the visible world was framed after the exemplar of the intellectual world; the soul of the visible world was first produced, then the corporeal figure, first that which proceeded from fire and earth, then that which came from air and water. Pythagoras, that the world was formed of five solid figures which are called mathematical; the earth was produced by the cube, the fire by the pyramid, the air by the…
Plutarch, Complete Works of Plutarch — Volume 3
States what Flat Earth is.
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At the same time it has so far a likeness to earth, in that it is susceptible of form, and to water in its adaptability to a variety of forms. In this respect, then, the earth is said to be "void and empty," or "invisible and shapeless," that matter is known by means of form. Hence, considered in itself, it is called "invisible" or "void," and its potentiality is completed by form; thus Plato says that matter is…
Aquinas Thomas, Summa Theologica, Part I
States what Flat Earth is; the author is tied to Flat Earth in the knowledge graph.
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The motion of the second is controlled by the first, and hence the oblique line in which the planets are supposed to move becomes a spiral. The motion of the same is said to be undivided, whereas the inner motion is split into seven unequal orbits—the intervals between them being in the ratio of two and three, three of either:—the Sun, moving in the opposite direction to Mercury and Venus, but with equal swiftness…
Plato, Timaeus
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Flat Earth

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