单项选择题

Elongation becomes zero at（）.

A.opposition
B.west quadrature
C.apogee
D.inferior conjunction

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单项选择题

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

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

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