Medieval scholars knew the Earth was round.

1230 · 1492 · apart: 262 years

Sacrobosco's textbook On the Sphere, written around 1230, was standard reading in European universities for some 400 years.

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The event

• Sacrobosco's De sphaerac. 1230 · Paris. Around 1230 the Paris master John of Sacrobosco wrote an astronomy textbook arguing that the Earth is a sphere. It was read in every European university for about 400 years and reprinted dozens of times after printing arrived.

13th century · 15th century

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