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 SunB the space motion of the solar systemC the precession of the equinoxesD the use of different reference points

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单选题

A sidereal day is shorter than a solar day. This difference is due to（）.

irregularities in the daily rotational rate of the Sun

the space motion of the solar system

the precession of the equinoxes

the use of different reference points

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A sidereal day is shorter than a solar day. This difference

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