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6 - Copernicus has heliocentric system but he refers to the...

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Copernicus has heliocentric system but he refers to the center of the earths orbit which is off center. He doesn't emphasize that sun is the center of the planetary system. Kepler does. Orbits of planets not in same plane. Some were a little tilted. He uses TYchos data to plot the actual orbits of the planets on a system. He finds they are close to circles but seem to be a little oval. Once the earth is in motion, then your distinctions between heavens and earth breaks down. Explain earth by physical motions and explain other planets with same physical causes and have different paths not necessarily perfect circles. Kepler began to use eccentric and equant to explain mars. He makes long and laborious calculations. Says still not as good as tycho's observations. Worked on this for years before deciding that this doesn't work. Respects data that we should put it to use, god has given the observations so we should come up with a model that will give us predictions that will help us make predictions. Says cannot have any inaccuracies. He
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