單項選擇題

Right ascension is primarily used by the navigator for（）.

A.calculating amplitudes
B.calculating great circle sailings by the Agiton method
C.entering the Air Navigation Tables (Selected Stars) Pub 249
D.plotting on star finders

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單項選擇題

Planetary aberration is due，in part，to（）.

A.refraction of light as it enters the Earth's atmosphere
B.rotation of the Earth on it's axis
C.the body's orbital motion during the time required for its light to reach Earth
D.a false horizon

單項選擇題

Perihelion is the point where the Sun（）.

A.is nearest to the Earth
B.is farthest from the Earth
C.is on the opposite side of the Earth from the Moon
D.and Moon and Earth are in line

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Right ascension is primarily used by the navigator for（）.

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Planetary aberration is due，in part，to（）.

Perihelion is the point where the Sun（）.

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Planetary aberration is due，in part，to（）.