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Some of the Almagest uses Hipparchus’s explanations of motions of heavenly bodies; however, Ptolemy added original ideas of his own. Rather than jumping directly into Ptolemy’s original contributions, the first two books of the Almagest provide an introduction to the basic observed motions of heavenly bodies and postulates of ancient Greek astronomy. Ptolemy postulated that Earth and the heavens were spherical and that all motions in the heavens were uniform circular motion. Book 3, on the Sun’s motion and the length of the year, as well as book 6, on eclipses, add nothing to the earlier work of Hipparchus. Books 7 and 8 contain a catalog of 1,028 stars. Ptolemy’s catalog was based on Hipparchus’s observations corrected for precession (the 26,000-year wobble as Earth spins on its axis) to the epoch 137 c.e.
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