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Lived from 90AD to 168AD believed in a Geocentric solar system. Thought the stars, sun and planets revolved around the Earth. He thought the earth was not in motion.
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Believed in a Heliocentric solar system. Believed that all spheres revolved around the Sun. Also discovered that Earth has two motions.
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improved the telescope Discovered that Venus had phases. Discovered lots about the milky way and various other planets.
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He caculated and recaculated the orbit of Mars and he concluded that all planets move in eclipses.
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(4 January 1643 – 31 March 1727) believed that all ob+j+ect+s have a gravitational pull.
