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

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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

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