Aristarchus (of Samos, 310 – 230 BCE) is the first known Greek to have proposed a heliocentric model (i.e. the earth rotates around the sun).
His theory was rejected in favor of the geocentric models (i.e. sun and planets rotate around the earth) of Aristotle (384-322 BCE) and later, Ptolemy (90-168 CE).
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Fixed from non-copyright image desribed as: “10th century CE Greek copy of Aristachus Samos’s 2nd century BCE calculations of the relative sizes of the Sun, Moon and the Earth” at http://en.wikipedia.org/wiki/Image:Aristarchus_working.jpg
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