Platonic year

Platonic year

noun Astronomy.
a period of about 26,000 years, equal to the time required for a complete revolution of the equinoxes.
Also called great year.


Origin:
1630–40

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WordNet
platonic year

noun
time required for one complete cycle of the precession of the equinoxes, about 25,800 years [syn: great year
WordNet® 3.0, © 2006 by Princeton University.
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