celestial longitudecelestial longitude
Astron. the arc of the ecliptic measured eastward from the vernal equinox to the point where the ecliptic is intersected by the great circle through the star, planet, etc. and the poles of the ecliptic
The angular distance eastward from the vernal equinox measured along the ecliptic to a great circle drawn through the pole of the ecliptic plane and a celestial body. Also called ecliptic longitude.