海船船员考试

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

题目
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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