單項選擇題太陽周年視運動的成因是()

A.地球繞太陽公轉(zhuǎn)
B.太陽繞地球公轉(zhuǎn)
C.地球自轉(zhuǎn)
D.月球繞地球公轉(zhuǎn)


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2.單項選擇題()將天球分成了南北天半球。

A.測者真地平圈
B.測者子午圈
C.天赤道
D.天體時圈

3.單項選擇題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

5.單項選擇題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