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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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
A.Hercules
B.Cygnus
C.Aquila
D.Capricorn
A.superior conjunction
B.inferior conjunction
C.opposition
D.None of the above; the elongation will never be zero
A.exhibits a change in magnitude
B.has a changing declination
C.is increasing in SHA
D.is also known as a red giant
A.double star
B.variable star
C.nova
D.nebula
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最新試題
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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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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()
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()
觀測天體高度前的準(zhǔn)備工作包括()①預(yù)求觀測時(shí)間②檢查秒表狀態(tài),使表時(shí)歸零③推算測天時(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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