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Used the Sun to measure the size of the round Earth. He was only off by 211 miles
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States that Earth is the center of the Universe. It was important because astronomers have been able to use his model for other answers
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Proposed a model of the solar system that involved the Earth revolving around the sun. Which changed the way scientist viewed the solar system. The Heliocentric SYtem
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Created detailed mathematical tables - Rudolphen Tables. 1627
Solar System - discovered that planets moved in elliptical orbits and his other laws which gave Newton the clues he needed to establish inverse-square gravitation. -
Determined that planets traveled around the Sun not in circles but in ellipses. He calculated the 3 laws involving the motion of planets that astronomers still use today.
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Calculated the 3 laws describing the motion of forces between objects. And theorized on the gravity theory.
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Predicted extraordinary astronomical phenomena like stars and black holes