celestial longitude(n = noun.location) ra, right ascension - (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; "one hour of right ascension equals fifteen degrees"
is a kind of angular distance
celestial, celestial body, celestial city, celestial equator, celestial globe, celestial guidance, celestial hierarchy, celestial horizon, celestial latitude, celestial mechanics, celestial navigation, celestial orbit, celestial point, celestial pole, celestial sphere, line of longitude, longitude, north celestial pole, south celestial pole