A sidereal day is shorter than a solar day. This difference is due to（）.
- Airregularities in the daily rotational rate of the Sun
- Bthe space motion of the solar system
- Cthe precession of the equinoxes
- Dthe use of different reference point
问题
A sidereal day is shorter than a solar
参考解析：
分类：天文航海题库
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