When1: -260
Who: Aristarchus of Samos
What: astronomer
Where: Alexandria, Egypt/Samos, Ionia
Detail: He lived -310 to -250, invented heliocentric theory [-260], calculated Earth-to-Sun distance to Earth-to-Moon distance ratio from angle at half moon, found Moon distance and size from Earth shadow on Moon during lunar eclipse, and stated causes of night and day and seasons.
Physical Sciences>Astronomy>History>Ancient Astronomy
5-Astronomy-History-Ancient Astronomy
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Date Modified: 2022.0224