单选题A sidereal day is shorter than a solar day. This difference is due to（）.Airregularities in the daily rotational rate of the SunBthe space motion of the solar systemCthe precession of the equinoxesDthe use of different reference points
单选题
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
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