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Essay heading: 8 Scientists
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Issue: Technology
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Date added: October 6, 1997
No of pages / words: 10 / 2796
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The life of Ptolomy is vague, as is the reaction to his works at the time. His system of astronomy, which is in his book the Syntaxis, was accepted as correct until the year 1543 AD. In this system, the earth was the center of the universe, and was the axis of a huge rotating sphere, which spun. On the outer edges of the sphere were the stars, and the sun and other heavenly bodies were in between the earth and stars...
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On the outer edges of the sphere were the stars, and the sun and other heavenly bodies were in between the earth and stars. Ptolomy accounted for the movement of the planets using three mathematical constructions: the eccentric, epicycle, and the equant. The eccentric construction is the only one of the three not centered on the earth...
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