2004/12/29 | 恒星月[Sidereal Month]
类别(¤〖天文〗) | 评论(0) | 阅读(46) | 发表于 13:26
The sidereal month is the time between maximum elevations of a fixed star as seen from the Moon. In 1994-1998, it was 27.321662 days.
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