odditiesanalysisThe Public Domain Review1865 · England

The 1865 book that revived flat Earth belief was written by a man who debated experts on tour

the gist

The modern flat-earth movement began with a Victorian Englishman, Samuel Rowbotham, who wrote as Parallax. In 1838 he carried out the Bedford Level experiment on a straight canal in Cambridgeshire, claiming that he could see a boat's hull at a distance where Earth's curvature should have hidden it, and in 1865 he published Zetetic Astronomy, saying that the Earth is a flat plane. 'Zetetic' means seeking, and Rowbotham insisted on trusting only what could be observed directly. Later experiments that repeated his test properly, accounting for atmospheric refraction, showed the curvature. Today's online flat-earth communities raise the question of how many members believe it and how many are playing a game.

so what

The history of flat-earth belief shows how a confident appeal to common sense can resist evidence, and how a persuasive writer can start a lasting movement. Educated people have known the Earth is round since antiquity.

fun fact

Greek scholar Eratosthenes estimated the Earth's circumference around 240 BC using shadows in two Egyptian cities.

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