單項(xiàng)選擇題Opposition occurs when().

A.the Sun,Earth,and Moon are at right angles
B.the Sun's declination is 0°and is moving south
C.an inferior planet is at the maximum angle to the line of sight to the Sun
D.the Earth is between a planet and the Sun


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1.單項(xiàng)選擇題On mid-ocean waters,the height of a wind-generated wave is not affected by the().

A.water depth exceeding 100 feet
B.fetch
C.wind's velocity
D.duration of the wind

2.單項(xiàng)選擇題Mars will not be visible().

A.at elongation angles near 180°
B.from quadrature to opposition
C.at conjunction
D.at opposition

3.單項(xiàng)選擇題It is difficult to determine which limb of the Moon is fully illuminated().

A.when the Moon is low in the sky at rising or setting
B.at the new Moon phase
C.when taking Moon sights during daylight
D.when the terminator is nearly vertical

4.單項(xiàng)選擇題In working out a local apparent noon sight for your latitude,you subtract the Ho from 90°. The 90°represents the angular distance from().

A.the equator to the elevated pole
B.your horizon to your zenith
C.your zenith to the elevated pole
D.the geographical position of the Sun to the elevated pole

5.單項(xiàng)選擇題In the navigational triangle,the angle at the elevated pole is the().

A.meridian angle
B.altitude
C.right ascension
D.azimuth angle

最新試題

在六分儀上直接讀取太陽(yáng)的下邊緣觀測(cè)高度,并利用英版《航海天文歷》求太陽(yáng)的真高度,則需要修正哪些誤差?()①器差②指標(biāo)差③眼高差④綜合改正⑤附加改正

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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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將觀測(cè)高度修正為真高度時(shí),不必進(jìn)行視差改正的天體是()

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天體高度與視差的關(guān)系,下列說(shuō)法正確的是()

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主、附港的潮時(shí)差為“-,說(shuō)明()

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航用海圖上繪畫天文船位線,當(dāng)天體真高度大于天體計(jì)算高度時(shí),應(yīng)()截取高度差。

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在觀測(cè)太陽(yáng)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(shuō)明太陽(yáng)方位為正()

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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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使用英版《航海天文歷》高度修正表求取行星真高度時(shí),總改正的查表引數(shù)是()

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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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