March 23, 2018

Spheres of the World

Around the year 1220, John of Holywood (Johannes de Sacrobosco) wrote De sphaera mundi (Spheres of the world) to introduce ideas from Ptolemy's Almagest to medieval Europe. His slim volume explained lunar and solar eclipses and presented evidence that Earth is indeed a sphere. The pages shown below are from a 1577 printed edition.

Reproduced from the collections of the Library of Congress

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