單項選擇題

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

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單項選擇題

A semidiameter correction is applied to observations of（）.

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

單項選擇題

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