The approximate positions of the stars are based on sidereal time，which is based upon rotation of the Earth relative to（）.<br>A:winter solstice<br>B:autumnal equinox<br>C:summer solstice<br>D:vernal equinox

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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