单项选择题

Sidereal time is used by navigators when（）.

A.used with the equation of time
B.used in the form of LHA Aries
C.calculating the time of moonrise
D.determining local apparent time

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单项选择题

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

单项选择题

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

单项选择题

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