A sidereal day is shorter than a solar day. This difference is due to（）.<br>A:irregularities in the daily rotational rate of the Sun<br>B:the space motion of the solar system<br>C:the precession of the equinoxes<br>D:the use of different reference points

A sidereal day is shorter than a solar day. This difference is due to（）.
A:irregularities in the daily rotational rate of the Sun
B:the space motion of the solar system
C:the precession of the equinoxes
D:the use of different reference points

出自：海船船员证

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