Aristarchus Argues Earth Revolves Around Sun
240 BC published
In On the Sizes and Distances Aristarchus makes certain hypotheses based on common observations of the heavens and comes to the conclusion that the sun is at the center of the universe with the Earth rotating around it!
His observations include the the apparent size of the sun and moon in the sky, the size of the Earth's shadow on the moon during an eclipse, and the idea that during a half moon the angle between the sun and the moon is 90°.
He then calculates distances such as the distance from Earth to moon and sun, as well as the sizes of these bodies.
The original is lost, but Archimedes's describes it in detail in his own book The Sand Reckoner.
Subjects Who or What published?
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Aristarchus of Samos (Ἀρίσταρχος ὁ Σάμιος) First person known to pr...
Objects To Whom or What was published?
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On the Sizes and Distances of the Sun and Moon (Περὶ μεγεθῶν καὶ ἀποστημάτων [ἡλίου καὶ σελήνης]) In On the Sizes and Dist...
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