單項(xiàng)選擇題Perihelion is the point where the Sun().

A.is nearest to the Earth
B.is farthest from the Earth
C.is on the opposite side of the Earth from the Moon
D.and Moon and Earth are in line


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1.單項(xiàng)選擇題Other than the Sun and Moon,the brightest object in the sky is().

A.Sirius
B.Canopus
C.Venus
D.Jupiter

2.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

3.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

4.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

5.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

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以()為引數(shù)查《航海天文歷》獲取太陽(yáng)、行星的格林時(shí)角和赤緯。

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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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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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天體高度越(),蒙氣差越()。航海上通常避免選擇高度()的天體。

題型:?jiǎn)雾?xiàng)選擇題

縮小六分儀邊差的方法是()

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航海六分儀的指標(biāo)差太大會(huì)給觀測(cè)帶來(lái)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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關(guān)于英版《航海天文歷》高度修正表中的太陽(yáng)高度總改正表的說(shuō)法正確的是()

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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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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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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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