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Aristarchus, Greek astronomer, 310-230 B.C. He pointed out, in 260 B.C., that the motions of the planets, sun, moon and stars could be explained if it were assumed that all the planets, including the Earth, orbited about the sun. Although his original writings are lost to us, the main part of his ideas were referred to and discussed by the Greek mathematician Archimedes and the Greek historian Plutarch. It is known that Copernicus was aware of the sun-centered theory of Aristarchus, having mentioned it in a note in the margin of an early draft of the manuscript of his classic document "Revolution of the Celestial Orbs." Copernicus apparently crossed out the note in the final version of that treatise, as if not wanting give anyone else credit for the idea.

The painting to the left,

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Aristarchus, Greek astronomer, 310-230 B.C. He pointed out, in 260 B.C., that the motions of the planets, sun, moon and stars could be accounted for if it were assumed that all the planets, including the Earth, orbited about the sun. Although his original writings are lost to us, the essence of his ideas were referred to and discussed by the Greek mathematician Archimedes and the Greek historian Plutarch. It is known that Copernicus was aware of the heliocentric theory of Aristarchus, having mentioned it in a note in the margin of an early draft of the manuscript of his classic treatise "Revolution of the Celestial Orbs." Copernicus apparently crossed out the note in the final version of that treatise, as if not wanting to dilute the perception of his own originality.

The painting to the left,

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