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Annus magnus. The Chaldaic astronomers observed that the fixed stars shift their places at about the rate of a degree in seventy-two years, according to which calculation they will perform one revolution in 25,920 years, at the end of which time they will return to their “as you were.” This revolution of the fixed stars is the annus magnus. The Egyptians made it 30,000 years, and the Arabians 49,000. (See Abulhasan's Meadows of Gold.)
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