單項(xiàng)選擇題天體地理位置坐標(biāo)中的地理緯度對(duì)應(yīng)的是天球坐標(biāo)系中的（）

A.赤緯
B.地方時(shí)角
C.格林時(shí)角
D.方位


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1.單項(xiàng)選擇題（）將天球分成了南北天半球。

A.測(cè)者真地平圈
B.測(cè)者子午圈
C.天赤道
D.天體時(shí)圈

2.單項(xiàng)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

4.單項(xiàng)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

5.單項(xiàng)選擇題The altitude at LAN may be observed by starting several minutes in advance and continuing until a maximum altitude occurs. This procedure should not be used（）.

A.when the declination and latitude are of different names
B.when the declination is greater than and the same name as the latitude
C.if the vessel is stopped or making bare steerageway
D.on a fast vessel on northerly or southerly headings