Greek philosopher and astronomer who may have been the first to realize that the Earth turns on its axis, from west to east, once every 24 hours. He also thought that the observed motions of Mercury and Venus suggested that they orbited the Sun rather than the Earth.
Born in Heraklea, near the Black Sea, Heraklides migrated to Athens
and studied at the Academy of Plato. He is said also to have attended
the schools of the Pythagorean philosophers, and would thus have come
into contact with Aristotle. All his writings are lost, so his astronomical
theories are known only at second hand.
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