sidereal [saɪˈdɪəriəl]

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adj.恒星的

of or calculated by the stars

The sidereal year is not used to construct a calendar. 恒星年不用于编制年历。
A sidereal day is about 4 minutes shorter than a solar day. 一个恒星日比一个太阳日大约短4分钟。