1. (astronomy) the angular distance of a celestial point measured westward along the celestial equator from the zenith crossing; the right ascension for an observer at a particular location and time of day. 
   （天文学）从天顶交叉口向西顺着天赤道测量的一个角距离；对在一个特定的地点和特定的时间观测者来说是赤经。
2. (astronomy) the angular distance to a point on a celestial object measured north or south from the celestial equator; expressed in degrees; used with right ascension to specify positions on the celestial sphere. 
   （天文学）到达某天体一点的角距，从天体赤道向北或向南测量得出；用角度表示；同赤经共指定天体表面上的位置。
3. The orbit of a celestial body. 
   天体的轨道
4. history of celestial body 
   天体史
5. The passage of a smaller celestial body or its shadow across the disk of a larger celestial body. 
   掩星一个较小的星体或它的阴影通过一个较大天体的圆平面

查看更多例句 相关情景会话

• 1. 天体赤经
  平太阳赤经 right ascension of a celestial body...天体赤经 right ascension of meridian...子午线赤经 right ascension of the mean sun
  www.ifanyi.cn - 相关搜索