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


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1.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

2.單項(xiàng)選擇題Altair is found in what constellation?()

A.Hercules
B.Cygnus
C.Aquila
D.Capricorn

3.單項(xiàng)選擇題After Venus passes the point of greatest elongation east in its orbit,the first position in which the elongation will be zero is().

A.superior conjunction
B.inferior conjunction
C.opposition
D.None of the above; the elongation will never be zero

4.單項(xiàng)選擇題A variable star is one that().

A.exhibits a change in magnitude
B.has a changing declination
C.is increasing in SHA
D.is also known as a red giant

5.單項(xiàng)選擇題A star that suddenly becomes several magnitudes brighter and then gradually fades is a().

A.double star
B.variable star
C.nova
D.nebula

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關(guān)于英版《航海天文歷》高度修正表中的太陽高度總改正表的說法正確的是()

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縮小六分儀邊差的方法是()

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

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下列天體觀測高度的幾個(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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將觀測高度修正為真高度時(shí),需要進(jìn)行半徑差改正的天體是()

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使用英版《航海天文歷》高度修正表求取真高度時(shí),所有天體必須修正的是()

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將觀測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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