An Etymological Dictionary of Astronomy and Astrophysics

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فرهنگ ریشه‌شناختی اخترشناسی-اخترفیزیک

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Besselian star constant
  پایای ِ اختری ِ بسلی  
pâyâ-ye axtari-ye Besseli
Fr.: constante stellaire besselienne  

Any of the eight quantities denoted by a, b, c, d (for → right ascension) and a’, b’, c’, d’ (for → declination) used in conjunction with → Besselian day numbers for the reduction of star’s → mean catalog place.

See also: → Besselian;
→ star; → constant.