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Hipparchus
Born: 190 B.C
Died: 120 B.C
Discovered the Precession of the Equinoxes
Developed the system of stellar magnitudes
Introduced the Babylonian angular notation of 360° in a circle.
He was geocentric.
http://www.astronomy.ohio-state.edu/~pogge/Ast161/Unit3/greek.html
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