An Etymological Dictionary of Astronomy and Astrophysics

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فرهنگ ریشه‌شناختی اخترشناسی-اخترفیزیک

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perihelion distance
  اپست ِ پیراهوری  
apest-e pirâhuri
Fr.: distance au périhélie  

The distance between the → Sun and an → object in orbit around it when they are at their closest approach.

See also: → perihelion; → distance.