An Etymological Dictionary of Astronomy and Astrophysics

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فرهنگ ریشه‌شناختی اخترشناسی-اخترفیزیک

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mean sidereal day
  روز ِ اختری ِ میانگین  
ruz-e axtari-ye miyângin
Fr.: jour sidéral moyen  

The average time interval between two successive → upper transits of the → mean equinox.

See also: → mean; → sidereal; → day.