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What if the pro-Flat Earth person was not modern? Cosmos Indicopleustes lived in the era of Justinian. Should he be categorized here?  —  Mr. Guye ( talk) ( contribs)  16:53, 5 May 2019 (UTC) reply

Yes. That Earth was not flat was already known since antiquity. To summarize the main article:

• Pythagoras (c. 570-495 BC) and Parmenides (c. 515- after 450 BC) both believed that the Earth was spherical.
• Artistotle (384-322 BC) both believed that the Earth was spherical, and produced an estimate of the Earth's circumference.
• Eratosthenes (c. 276- 195 BC) both believed that the Earth was spherical, and produced a more accurate of the Earth's circumference. He also calculated the Earth's axial tilt, and its distance from the Sun. Dimadick ( talk) 09:48, 6 May 2019 (UTC) reply

Should be included here 2601:182:C80:3E10:6F10:B3FA:123B:CD78 ( talk) 17:23, 18 December 2022 (UTC) reply

Read: Wikipedia:FAQ/Categorization#How_do_I_add_an_article_to_a_category? Shellwood ( talk) 17:46, 18 December 2022 (UTC) reply