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Ptolemy's theory, primarily encapsulated in the geocentric model, posited that the Earth was at the center of the universe, with all celestial bodies, including the Sun and planets, orbiting around it. This model was flawed because it could not accurately account for the observed motions of planets, leading to complex epicycles to explain retrograde motion. Additionally, it contradicted observations made by later astronomers, such as Copernicus and Galileo, who provided evidence for the heliocentric model, where the Sun is at the center of the solar system. Ultimately, Ptolemy's theory was limited by its inability to incorporate the principles of heliocentrism and the laws of planetary motion.

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1mo ago

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