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Aristarchus of Samos
Wikipedia article
http://en.wikipedia.org/wiki/Aristarchus_of_Samos
Resource Type: Unclassified
Aristarchus of Samos (c.310 – c.230 BC) was an ancient Greek astronomer and mathematician who presented the first known heliocentric model that placed the Sun at the center of the known universe, with the Earth revolving around the Sun once a year and rotating about its axis once a day.
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