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.)
More on Year from Infoplease:
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- Christian year - Christian year: Definition and Pronunciation
- Platonic year - Platonic year: Definition and Pronunciation
- off year - off year: Definition and Pronunciation
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