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Hipparchus also undertook to make a register of the stars by the method of alineations that is, by indicating those which were in the same apparent straight line. The number of stars catalogued by him was 1,080.
He adopted the theory of epicycles and eccentrics, a geometrical conception for the purpose of resolving the apparent motions of the heavenly bodies on the principle of circular movement. He also undertook to make a catalogue of the stars by the method of alineations that is, by indicating those that are in the same apparent straight line. The number of stars so catalogued was 1,080.
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