Geocentric Theory (jan 1, 1068 – jan 1, 1167)

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Made mathematical calculations relating to astronomy. This system was a standard explanation of the place of the earth in the heavens combined with the mathematical astronomy of Ptolemy and the physical cosmology of Aristotle. It reasoned that the earth had to be the center of the universe because of its heaviness and gave rise to many problems, specifically the observed motions of the planets.

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