An Etymological Dictionary of Astronomy and Astrophysics

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فرهنگ ریشه‌شناختی اخترشناسی-اخترفیزیک

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equation of the equinoxes
  هموگش ِ هموگانها  
hamugeš-e hamugânhâ
Fr.: équation des équinoxes  

The difference between → apparent sidereal time and → mean sidereal time. It is due to the nutation of the Earth’s polar axis of rotation about its precessional motion. It ranges from +0.8 to +1.2 seconds. Also known as → nutation in right ascension.

See also: → equation; → equinox.