单项选择题

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

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单项选择题

A phase correction is applied to observations of（）.

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

单项选择题

A parallax correction is NOT applied to observations of the（）.

A.stars
B.Moon
C.Sun
D.Planets

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