Aristarchus, who lived from 310 B.C. to 230 B.C., was yet another successful Greek mathematician and astronomer. He was one of the first exponents of a sun-centered (not Earth-centered) universe (where the earth goes around the sun). He made pioneering attempts to predict the sizes of the moon and sun; bad instruments were the only reasons he was incorrect. However, he was definitely correct in predicting the length of a solar year.

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