Copernicus model gives a deeper analysis of the solar systems and it is a better version as compared to the Ptolemyâ€™s model. For instance, Copernicus rejected Ptolemyâ€™s equant scheme and found out that, all the heavenly bodies move in uniform circles. Both motions move in the same direction uniformly although one is faster than the other. However, both Copernicusâ€™ model and Ptolemyâ€™s contains equal numbers of epicycles although Ptolemyâ€™s epicycles are bigger than Copernicus.
Copernicusâ€™s assertion that the sun was the center of the solar system was driven by two forces. The first force was the failure of Ptolemaic model to give precise prediction about the positions of the planets. This is because Ptolemaic relied on mathematical devices and the device which was believed to produce easy predictions was assumed to be true. The second reason was that, Copernicus was opposed to the fact that Ptolemy used big epicycles to elucidate the retrospective motions of the planets. According to him, the motion of the planets could be elucidated by assuming that the earth also moves around the sun
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