celestial l equator天赤道
lunar celestial equator月球天体赤道
The Celestial Equator赤道
celestial equator system of coordinates天球赤道坐标系统;天赤道座标系统;天文赤道坐标系
equator celestial天球赤道
N（名词） the great circle lying on the celestial sphere the plane of which is perpendicular to the line joining the north and south celestial poles 天赤道 (Also called equinoctial, equinoctial circle)