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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2.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

3.單項選擇題An amplitude of the Sun in high latitudes（）.

A.is most accurate before sunrise
B.is most accurate after sunset
C.should only be observed when the Sun's lower limb is above the horizon
D.is most accurate when the Sun's center is observed on the visible horizon

4.單項選擇題Altair is found in what constellation?（）

A.Hercules
B.Cygnus
C.Aquila
D.Capricorn

5.單項選擇題After Venus passes the point of greatest elongation east in its orbit，the first position in which the elongation will be zero is（）.

A.superior conjunction
B.inferior conjunction
C.opposition
D.None of the above; the elongation will never be zero