相关考题
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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 -
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 -
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
