Ptolemy based his model on theories first developed by Plato, who believed each celestial body traveled around a small circle that followed a larger circle around Earth.

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Ptolemy's model was based on the geocentric theory, which involved epicycles and deferents, but it was not directly based on Plato's theories. Plato did not develop the specific model of epicycles and deferents that Ptolemy used.

Ptolemy Based His Model on Theories First Developed by Plato