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Ptolemy had many major contributions of the time period, but the most influential contribution was his embracement of the solar system, also known as the Ptolemaic system. In the Ptolemaic system, the earth was the center of the universe. Ptolemy combined existing information to create a model that would last nearly 1,500 years.
Ptolemy's geocentric system stood for 1,500 years until Nicholas Copernicus, a polish astronomer, proposed that the planets have the Sun as the fixed center, which their motions are to be referred. That the Earth is a planet, which besides orbiting the Sun annually, also turns once daily on its own axis; and "that very slow, long term changes in the direction of this axis account for the precession of the equinoxes...
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