Flat Earth
The flat Earth model is an archaic and scientifically disproven conception of Earth's shape as a plane or disk. Many ancient cultures subscribed to a flat Earth cosmography, including Greece until the classical period, the Bronze Age and Iron Age civilizations of the Near East until the Hellenistic period, and China until the 17th century. The idea of a spherical Earth appeared in ancient Greek philosophy with Pythagoras, although most pre-Socratics retained the flat Earth model. In the early 4th century BC, Plato wrote about a spherical Earth, and by about 330 BC his former student Aristotle had provided strong empirical evidence for this. Knowledge of the Earth's global shape then gradually began to spread beyond the Hellenistic world. Despite the scientific fact and obvious effects of Earth's sphericity, pseudoscientific flat Earth conspiracy theories are espoused by modern flat Earth societies and, increasingly, by unaffiliated individuals using social media.