An Etymological Dictionary of Astronomy and Astrophysics

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فرهنگ ریشه‌شناختی اخترشناسی-اخترفیزیک

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Yerkes system
  راژمان ِ یرکیز  
râžmân-e Yerkes
Fr.: système de Yerkes  

Same as → Morgan-Keenan classification.

See also: After Yerkes Observatory, where the classification was developed; → system.