Greek philosopher and astronomer
Little is known about his life. He was the pupil of Thales. His writings
are now lost, but he is credited with variety of novel ideas. He was the first
Greek to use sundial, and with it found the dates of the two solstices(shortest
and longest days) and of the equinoxes(the two annual occasions when day and
night are equal).
He speculates in the nature of the heavens and on the origin of the
earth and of man. Realizing that earth's surface was curved, he believed it to
be cylindrical( with its axis east to west); and he was probably the first
Greek to map the whole known world.
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