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

最新試題

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(guān)測(cè)天體時(shí)的六分儀指標(biāo)差,是因?yàn)椋ǎ?/p>

題型:?jiǎn)雾?xiàng)選擇題

下列天體觀(guān)測(cè)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

題型:?jiǎn)雾?xiàng)選擇題

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

題型:?jiǎn)雾?xiàng)選擇題

主、附港的潮時(shí)差為“-,說(shuō)明()

題型:?jiǎn)雾?xiàng)選擇題

航海六分儀的指標(biāo)差太大會(huì)給觀(guān)測(cè)帶來(lái)不便,因此當(dāng)指標(biāo)差大于()時(shí),就應(yīng)該縮小它。

題型:?jiǎn)雾?xiàng)選擇題

縮小六分儀邊差的方法是()

題型:?jiǎn)雾?xiàng)選擇題

英版《潮汐表》中,潮高差是()

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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()

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在六分儀上直接讀取太陽(yáng)的下邊緣觀(guān)測(cè)高度,并利用英版《航海天文歷》求太陽(yáng)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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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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