An Etymological Dictionary of Astronomy and Astrophysics

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فرهنگ ریشه‌شناختی اخترشناسی-اخترفیزیک

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geodetic vertical
  هجین ِ زمین‌سنجیک  
hajin-e zamin-sanjik
Fr.: vertical géodésique  

The direction defined by the → normal to the → reference ellipsoid at the point in question.

See also: → geodetic; → vertical.