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Claudius Ptolemy lived in Greece. He thought of the geocentric theory. This was wrong although his theory of the planets rotating and revolving was correct. He also wrote two books called Geographia and Almagest.
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Nicolaus Copernicous was the first astronomrto have the idea of the heliocentric theory. He was Polish. He thought that the planets revolved in circles.
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Galileo Galilei was an Italian Astronomer who supported the heliocentric theory. He studied Venus's phases with his invention of the telescope. He also studied Jupiter's moons to show not everything revolved around the earth. He discovered inertia. His last discovery was that the light side of the moon was just a reflection of sunlight.
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Johannes Kepler was a german mathmatition who supported the heliocentric theory. He studied brahe's data to find out how mars orbited. He found out that planets orbit in an ellipse or oval path. HE also discovered that the distance a planet is from the sun determans how fast it travels.
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Issac Newton was an English Astronomer who supported the heliocentric theory. He used gravity and inertia to find out how the planets stay in orbit.
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