Nicolau Copernicus
(About.com) Medieval astronomers worked from Ptolemy's theory that the earth was the center of the universe, and that everything revolved around it. But back in the 3rd century B.C., Aristarchus of Samos had hypothesized that the earth revolved around the sun.
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updated 963 (Medieval History), inserted 10, updated 0, at 2012-05-31 05:26:24
