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1·A new method utilizing zenith observing to calibrate star sensor was proposed.

提出了一种利用天顶观测来进行星敏感器标定的新方法。

2·The grazing occultation of the star by the Moon is observed in the zenith at the Earth's equator.

某星被月球的掩星现象出现在地球赤道的天顶上。

3·They are the curvature corrections for recording time at the determined zenith distances when a star passes the prime vertical and the meridian circle.

卯酉方向天顶距的星径曲率改正以及子午方向天顶距的星径曲率改正。