| 单词 | 一个天 |
| 释义 | 〔gravisphere〕The spherical region of space dominated by the gravitational field of a celestial body.引力层：一个天体引力场所支配的球状空间区域〔transit〕The passage of a celestial body across the observer's meridian.凌日：一个天体经过观测者的最高点〔Trojan〕Of or relating to a celestial body, especially an asteroid, that is in one of the Lagrangian points of a two-body system. Used especially of any of a group of asteroids that orbit at Jupiter's distance from the sun, but 60° ahead of or behind the planet.特洛伊银河体系：为双体系统中拉格朗日点上一个天体的，尤指小行星，或与之相关的。特别用于指代以木星到太阳的距离沿轨道运行，但以60或更高的角度，位于行星之前或之后的一群小行星中的任何一个〔ephemeris〕A table giving the coordinates of a celestial body at a number of specific times during a given period.星历表：一张给出一定时期内一个天体在一些特定时间的坐标的表 |
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