单项选择题
Superior conjunction occurs when（）.
A.the Sun is at maximum declination north or south
B.a planet crosses the external plane of the ecliptic
C.the Sun is between the Earth and a planet
D.two planets are in line
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相关考题
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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 -
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
