a b Wolchover, Natalie (30 May 2017). "Are Flat-Earthers Being Serious?". Live Science. Archived from the original on 8 May 2021 . Retrieved 17 January 2019. Johnson, Charles K. (December 1978). "Flat Earth News: News of the World's Children" (PDF). Lancaster, California: International Flat Earth Research Society. p.2. Robert J. Schadewald. "The Flat-out Truth". Lhup.edu. Archived from the original on 29 December 2017 . Retrieved 22 January 2018.

Timmer, John (17 March 2019). "Behind the Curve a fascinating study of reality-challenged beliefs". Ars Technica . Retrieved 13 April 2019.

LUI, KEVIN (26 September 2017). "Rapper B.o.B. Has Started a GoFundMe Campaign to Prove That the Earth Is Flat". TIME . Retrieved 31 July 2023. De Civitate Dei, Book XVI, Chapter 9 – Whether We are to Believe in the Antipodes, translated by Rev. Marcus Dods; from the Christian Classics Ethereal Library at Calvin College.

Parallax (Samuel Birley Rowbotham) (1881). Zetetic Astronomy: Earth Not a Globe (Thirded.). London: Simpkin, Marshall, and Co. How YouTube converted people to flat Earth". BBC News. 18 July 2019. Archived from the original on 6 June 2021 . Retrieved 17 November 2019. Severian, Bishop of Gabala ( d. 408), wrote that the Earth is flat and the Sun does not pass under it in the night, but "travels through the northern parts as if hidden by a wall". [88] Basil of Caesarea (329–379) argued that the matter was theologically irrelevant. [89] Europe: Early Middle Ages Organisations sceptical of fringe beliefs have occasionally performed tests to demonstrate the local curvature of the Earth. One of these, conducted by members of the Independent Investigations Group, at the Salton Sea on 10 June 2018 was attended also by supporters of a flat Earth, and the encounter between the two groups was recorded by the National Geographic Explorer. This experiment successfully demonstrated the curvature of the Earth via the disappearance over distance of boat-based and shore-based targets. [91] [92]Nguyen, Hoang (2 April 2018). "Most flat earthers consider themselves very religious". YouGov . Retrieved 31 July 2023. But a fringe society founded in the 1950s, dedicated to insisting that the Earth is flat, has given rise to a modern ground of flat Earth adherents. These believers claim that the Earth is a flat disc, and that evidence that it is round — say, pictures taken from space — are an elaborate hoax involving multiple governments. Opinions differ on exactly how the flat Earth works, with believers concocting elaborate versions of physics and creative interpretations of the solar system to make their theories work. Documenting the Existence of 'The International Flat Earth Society' ". talk.origins . Retrieved 26 December 2013. Pseudo-Plutarch. Placita Philosophorum. Perseus Digital Library. V.3, Ch.10 . Retrieved December 24, 2014. Real-time Worldwide Flight Traffic" . Retrieved 11 February 2022. (Gerling-Dunsmore's claims were verified on this date at 03:30 UTC, though not all flights were visible when fully zoomed out - a possible source of confusion.)