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Emily learns that ancient astronomers, such as Ptolemy, created a model of the solar system based only on what they could see with their eyes. Describe Ptolemy's model of the solar system and how he came to his conclusions. Then describe Galileo's model of the solar system. Explain how Galileo proved that his model was correct and that Ptolemy’s was not correct.

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Explanation:

Galileo found Venus went through the entire phase cycle, proving that she revolved completely around the Sun, as predicted by Copernicus in his heliocentric model. ... The phases of Venus could not be explained by Ptolemy's Geocentric Model. Galileo knew that the Roman Catholic Church was incorrect.