![]() ![]() However, the advent of Kepler’s laws and subsequent explanation by Newton, rendered the geocentric model obsolete. Ptolemy’s epicyclic, geocentric model, in use until the Renaissance, was very accurate in terms of predicting the positions of planets and the times of eclipses. This can explain retrograde motion, but his model doesn’t fit all the planetary position data that well. His model has the planets moving around the Sun in circular orbits. The first big problem with the geocentric model was the retrograde motion of planets like Mars. 15 What would happen if the sun revolves around the earth?.13 Who opposed the heliocentric theory?.12 How did Galileo prove the Copernican theory?.7 What was wrong with the Copernican model?.6 Who thought the earth was the center of the universe?.3 Why is Ptolemy’s geocentric astronomy inaccurate?. ![]()
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