單項(xiàng)選擇題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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1.單項(xiàng)選擇題A sidereal day is approximately how much shorter than a solar day?（）

A.4 minutes
B.8 minutes
C.12 minutes
D.16 minutes

2.單項(xiàng)選擇題A sextant having an index error that is off the arc has a（）.

A.positive correction
B.dip error
C.negative correction
D.semidiameter error

3.單項(xiàng)選擇題A semidiameter correction is applied to observations of（）.

A.Mars
B.the Moon
C.Jupiter
D.All of the above

4.單項(xiàng)選擇題A phase correction may be applicable to correct the sextant altitude correction of（）.

A.any star
B.the Sun
C.third magnitude stars only
D.some planets

5.單項(xiàng)選擇題A phase correction is applied to observations of（）.

A.the Sun
B.stars
C.planets
D.All of the above