单项选择题
A.测者真地平圈B.测者子午圈C.天赤道D.天体时圈
The approximate positions of the stars are based on sid...
单项选择题The approximate positions of the stars are based on sidereal time，which is based upon rotation of the Earth relative to（）.
A.winter solstice B.autumnal equinox C.summer solstice D.vernal equinox
The angle measured at the observer’s meridian from the ...
单项选择题The angle measured at the observer’s meridian from the elevated pole，clockwise or counterclockwise up to 180°，to the vertical circle of the body is the（）.
A.local hour angle B.azimuth angle C.meridian angle D.longitude
The angle at the pole measured through 180°from the pri...
单项选择题The angle at the pole measured through 180°from the prime meridian to the meridian of a point is known as（）.
A.the departure B.the polar arc C.longitude D.Greenwich hour angle
