（）将天球分成了南北天半球。

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

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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

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