Definition
ANGULAR DISTANCE east of the VERNAL EQUINOX, along the ECLIPTIC; the arc of the ECLIPTIC or the angle at the ecliptic pole between the CIRCLE OF LATITUDE of the VERNAL EQUINOX and the CIRCLE OF LATITUDE of a point on the CELESTIAL SPHERE, measured eastward from the CIRCLE OF LATITUDE of the VERNAL EQUINOX, through 360°.