An Etymological Dictionary of Astronomy and Astrophysics

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فرهنگ ریشه‌شناختی اخترشناسی-اخترفیزیک

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Greenwich Mean Sidereal Time (GMST)
  زمان ِ اختری ِ میانگین ِ گرینویچ  
zamân-e axtari-ye miyângin-e Greenwich
Fr.: temps sidéral moyen de Greenwich  

The → sidereal time related to the angle between the → prime meridian and the → mean vernal equinox, measured in the plane of the equator.

See also: → mean; → Greenwich Meridian; → sidereal; → time.