The Ptolemaic model was first developed in the second century. It was believed to be a complicated astronomical system that managed to estimate the position of each planet. Ptolemy observed that the motion of the planets would only be estimated through a mathematical devise and that the model that gives the right answer should be adopted since it is hard to know the truth. Ptolemyâ€™ model assumed that, the earth and not the sun was the center of the solar system. Just like Copernicus, Ptolemy found that, planets move on an epicycle that moves in a much bigger circle referred to as a deferent. He assumed that the stars move around the spheres of the other planets.
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