單項(xiàng)選擇題Diurnal aberration is due to().

A.motion of the Earth in its orbit
B.rotation of the Earth on its axis
C.the body's orbital motion during the time required for its light to reach the Earth
D.a false horizon


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1.單項(xiàng)選擇題Capella is found in what constellation? ()

A.Gemini
B.Auriga
C.Libra
D.Crab

2.單項(xiàng)選擇題Because the actual center of some planets may differ from the observed center,the navigator applies a correction known as the().

A.phase correction
B.refraction correction
C.semidiameter correction
D.augmentation correction

4.單項(xiàng)選擇題Apparent altitude is sextant altitude corrected for().

A.parallax and personal error
B.inaccuracies in the reading and reference level
C.visibility and magnitude
D.All of the above are correct

5.單項(xiàng)選擇題An amplitude of the Sun in high latitudes().

A.is most accurate before sunrise
B.is most accurate after sunset
C.should only be observed when the Sun's lower limb is above the horizon
D.is most accurate when the Sun's center is observed on the visible horizon

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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下列天體觀測(cè)高度的幾個(gè)訂正值中恒為“-”的是()①眼高差②視差③蒙氣差④半徑差

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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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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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《航海天文歷》中列出的太陽(yáng)出沒(méi)時(shí)刻是()

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航海上測(cè)定指標(biāo)差時(shí),可以利用()①星體②太陽(yáng)③水天線

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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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英版《潮汐表》中,潮高差是()

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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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