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


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1.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

3.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

4.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

5.單項(xiàng)選擇題Superior conjunction occurs when().

A.the Sun is at maximum declination north or south
B.a planet crosses the external plane of the ecliptic
C.the Sun is between the Earth and a planet
D.two planets are in line

最新試題

平放六分儀,刻度弧朝外將指標(biāo)桿移至(),眼睛置于動(dòng)鏡后檢查六分儀的動(dòng)鏡差。

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英版《潮汐表》中,潮高差是()

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根據(jù)《航海天文歷》查取天體位置的查表引數(shù)是()

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一般觀測(cè)天體定位應(yīng)避免觀測(cè)高度較低的天體,其主要原因是()

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下列哪項(xiàng)不是高度差法求天文船位線的三要素?()

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使用航海六分儀測(cè)天時(shí),不能用近物標(biāo)測(cè)定的指標(biāo)差作為觀測(cè)天體時(shí)的六分儀指標(biāo)差,是因?yàn)椋ǎ?/p>

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航海六分儀的指標(biāo)差太大會(huì)給觀測(cè)帶來不便,因此當(dāng)指標(biāo)差大于()時(shí),就應(yīng)該縮小它。

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在觀測(cè)太陽中天高度求緯度計(jì)算中,當(dāng)其高度命名為N,頂距命名為S,說明太陽方位為正()

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天體高度越(),蒙氣差越()。航海上通常避免選擇高度()的天體。

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測(cè)者可自行校正的六分儀誤差有:①定鏡差;②指標(biāo)差;③動(dòng)鏡差。三者正確的校正順序是()

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