An Etymological Dictionary of Astronomy and Astrophysics

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فرهنگ ریشه‌شناختی اخترشناسی-اخترفیزیک

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Platonic year
  سال ِ پلاتونی، ~ افلاتونی  
sâl-e Plâtoni, ~ Aflâtuni
Fr.: année platonique  

The time required for a complete revolution of the Earth’s pole on the celestial sphere as the result of → precession. A Platonic year is equal to
25 800 years.

See also: Of or pertaining to Gk. philosopher Plato, from Gk. Platon “broad-shouldered,” from platys “broad.” → year.