單項選擇題

Because the actual center of some planets may differ from the observed center，the navigator applies a correction known as the（）.

A.phase correction
B.refraction correction
C.semidiameter correction
D.augmentation correction

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單項選擇題

As observed from the Earth，the angle between lines from the Earth to the Sun and the Earth to an inferior planet is known as（）.

A.elongation
B.conjunction
C.opposition
D.quadrature

單項選擇題

Apparent altitude is sextant altitude corrected for（）.

A.parallax and personal error
B.inaccuracies in the reading and reference level
C.visibility and magnitude
D.All of the above are correct