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
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
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