celestial longitude

Other forms: celestial longitudes

Definitions of celestial longitude

1. noun

   (astronomy) the equatorial coordinate specifying the angle, measured eastward along the celestial equator, from the vernal equinox to the intersection of the hour circle that passes through an object in the sky; usually expressed in hours and minutes and seconds; used with declination to specify positions on the celestial sphere
   synonyms: RA, right ascension

   type of:

   angular distance

   the angular separation between two objects as perceived by an observer