单项选择题
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
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Capella is found in what constellation? （）
A.Gemini
B.Auriga
C.Libra
D.Crab -
单项选择题
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
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单项选择题
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
