单选题The approximate positions of the stars are based on sidereal time，which is based upon rotation of the Earth relative to（）.Awinter solsticeBautumnal equinoxCsummer solsticeDvernal equinox
单选题
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
参考解析
解析：
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