An Etymological Dictionary of Astronomy and Astrophysics

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فرهنگ ریشه‌شناختی اخترشناسی-اخترفیزیک

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astronomical clock
  ساعت ِ اخترشناسیک  
sâ'at-e axtaršenâsik
Fr.: horloge astronomique  

A precise pendulum clock with separate dials for seconds, minutes, and hours. It was originally used by astronomers to calculate astronomical time.

See also: → astronomical; → clock.