單項(xiàng)選擇題Mars will not be visible().

A.at elongation angles near 180°
B.from quadrature to opposition
C.at conjunction
D.at opposition


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1.單項(xiàng)選擇題It is difficult to determine which limb of the Moon is fully illuminated().

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

2.單項(xiàng)選擇題In working out a local apparent noon sight for your latitude,you subtract the Ho from 90°. The 90°represents the angular distance from().

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

3.單項(xiàng)選擇題In the navigational triangle,the angle at the elevated pole is the().

A.meridian angle
B.altitude
C.right ascension
D.azimuth angle

4.單項(xiàng)選擇題In the horizon system of coordinates what is equivalent to latitude on the Earth?().

A.Altitude
B.Zenith
C.Declination
D.Zenith distance

5.單項(xiàng)選擇題In the horizon system of coordinates what is equivalent to the equator on the Earth?().

A.Prime vertical circle
B.Principal vertical circle
C.Parallels of altitude
D.Horizon

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測(cè)者可自行校正的六分儀誤差有:①定鏡差;②指標(biāo)差;③動(dòng)鏡差。三者正確的校正順序是()

題型:?jiǎn)雾?xiàng)選擇題

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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在中版《航海天文歷》的“恒星視位置表”中可查取恒星的()①地方時(shí)角②格林時(shí)角③共軛赤經(jīng)④赤緯

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在六分儀上直接讀取太陽的下邊緣觀測(cè)高度,并利用中版《航海天文歷》求太陽的真高度,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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將觀測(cè)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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天體高度與視差的關(guān)系,下列說法正確的是()

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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。

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在六分儀上直接讀取金星的觀測(cè)高度,并利用《航海天文歷》求金星的真高度,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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《航海天文歷》中列出的太陽出沒時(shí)刻是()

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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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