
Exploring the claim...
Ancient cosmologies commonly depicted the earth as a disc, perhaps because of the apparently circular horizon seen from the ground. Perhaps a capitol city or important temple marked its center. Perhaps the perimeter took the form of an impassable ocean, mountain range, or ice wall as in one version of modern flat earth theory.
Early claims of a disc-shaped earth melded with mythology, rendering unclear the direction of inference between the two (if the word inference even captures the relationship at all). When philosophers in Greece proposed a round earth, however, logical and empirical defenses of a flat earth began to form. Anaxagoras argued:
This one is still a work in progress...