(born &circa; 310 &BC;—died &circa; 230 &BC;) Greek astronomer.
His advanced ideas on the movement of the Earth (which he asserted revolved around the Sun) are known from Archimedes and Plutarch. His only surviving work is the short treatise “On the Sizes and Distances of the Sun and Moon”; though the values he obtained are inaccurate, he showed that the Sun and stars are at immense distances. A peak in the centre of a lunar crater named for him is the brightest formation on the Moon.
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