A.Sirius
B.Canopus
C.Venus
D.Jupiter
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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
A.water depth exceeding 100 feet
B.fetch
C.wind's velocity
D.duration of the wind
A.at elongation angles near 180°
B.from quadrature to opposition
C.at conjunction
D.at opposition
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
A.the equator to the elevated pole
B.your horizon to your zenith
C.your zenith to the elevated pole
D.the geographical position of the Sun to the elevated pole
最新試題
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()
測者可自行校正的六分儀誤差有:①定鏡差;②指標(biāo)差;③動鏡差。三者正確的校正順序是()
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。
太陽方位正南,觀測太陽上中天高度求緯度,則()
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
天體高度與視差的關(guān)系,下列說法正確的是()
影響蒙氣差的因素有()①氣溫②氣壓③天體高度
以()為引數(shù)查《航海天文歷》獲取太陽、行星的格林時(shí)角和赤緯。
航海上測定指標(biāo)差時(shí),可以利用()①星體②太陽③水天線
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