单项选择题
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
Sidereal time is used by navigators when（）.A.used with ...
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
Sidereal time is NOT used（）.A.as the basis for star cha...
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
Right ascension is primarily used by the navigator for（...
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
