An Etymological Dictionary of Astronomy and Astrophysics

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فرهنگ ریشه‌شناختی اخترشناسی-اخترفیزیک

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Besselian day number
  شماره‌ی ِ روز ِ بسلی  
šomâre-ye ruz-e Besseli
Fr.:  

Any of the five quantities denoted by A, B, C, D, and E used in conjunction with → Besselian star constants for the reduction of a star’s → mean catalog place to its → apparent place.

See also: → Besselian;
→ day; → number.