noun
: a coordinate in the equator system of coordinates used by navigators in place of right ascension, measured westward from the March equinox, and expressed in degrees up to 360°
noun
: a coordinate in the equator system of coordinates used by navigators in place of right ascension, measured westward from the March equinox, and expressed in degrees up to 360°
Webster's New International English Dictionary. Новый международный словарь английского языка Webster. 2012