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


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1.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

2.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

3.單項(xiàng)選擇題A star is observed at lower transit. The line of position derived from this sight is().

A.on the prime vertical
B.a latitude line
C.a longitude line
D.of no special significance

4.單項(xiàng)選擇題A sidereal day is shorter than a solar day. This difference is due to().

A.irregularities in the daily rotational rate of the Sun
B.the space motion of the solar system
C.the precession of the equinoxes
D.the use of different reference points

5.單項(xiàng)選擇題A sidereal day is approximately how much shorter than a solar day?()

A.4 minutes
B.8 minutes
C.12 minutes
D.16 minutes

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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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六分儀觀測(cè)天體高度的要領(lǐng)是,大擺(),小擺(),微擺()。

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英版《潮汐表》中,潮高差是()

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觀測(cè)天體高度前的準(zhǔn)備工作包括()①預(yù)求觀測(cè)時(shí)間②檢查秒表狀態(tài),使表時(shí)歸零③推算測(cè)天時(shí)的天文鐘鐘差④提前將六分儀拿到室外,適應(yīng)環(huán)境溫度⑤檢查校正六分儀誤差,調(diào)整好望遠(yuǎn)鏡焦距

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縮小六分儀邊差的方法是()

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關(guān)于英版《航海天文歷》高度修正表中的眼高差表的說(shuō)法正確的是()

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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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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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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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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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