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（）.
单项选择题 Right ascension is primarily used by the navigator for（）.
单项选择题 Planetary aberration is due，in part，to（）.
