單項選擇題During one synodic rotation，a body makes one complete turn relative to the（）.

A.Earth
B.Sun
C.stars
D.vernal equinox


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1.單項選擇題Diurnal aberration is due to（）.

A.motion of the Earth in its orbit
B.rotation of the Earth on its axis
C.the body's orbital motion during the time required for its light to reach the Earth
D.a false horizon

2.單項選擇題Capella is found in what constellation? （）

A.Gemini
B.Auriga
C.Libra
D.Crab

3.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

5.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