單項(xiàng)選擇題

Sidereal time is NOT used（）.

A.as the basis for star charts
B.to enter a star finder
C.in sight reduction using Pub 249
D.in sight reductions of planet observations

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單項(xiàng)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

單項(xiàng)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

Sidereal time is NOT used（）.

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

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

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