單項(xiàng)選擇題Right ascension is primarily used by the navigator for().

A.calculating amplitudes
B.calculating great circle sailings by the Agiton method
C.entering the Air Navigation Tables (Selected Stars) Pub 249
D.plotting on star finders


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1.單項(xiàng)選擇題Planetary aberration is due,in part,to().

A.refraction of light as it enters the Earth's atmosphere
B.rotation of the Earth on it's axis
C.the body's orbital motion during the time required for its light to reach Earth
D.a false horizon

2.單項(xiàng)選擇題Perihelion is the point where the Sun().

A.is nearest to the Earth
B.is farthest from the Earth
C.is on the opposite side of the Earth from the Moon
D.and Moon and Earth are in line

3.單項(xiàng)選擇題Other than the Sun and Moon,the brightest object in the sky is().

A.Sirius
B.Canopus
C.Venus
D.Jupiter

4.單項(xiàng)選擇題Opposition occurs when().

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

5.單項(xiàng)選擇題On mid-ocean waters,the height of a wind-generated wave is not affected by the().

A.water depth exceeding 100 feet
B.fetch
C.wind's velocity
D.duration of the wind

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太陽方位正南,觀測太陽上中天高度求緯度,則()

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平放六分儀,刻度弧朝外將指標(biāo)桿移至(),眼睛置于動鏡后檢查六分儀的動鏡差。

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在六分儀上直接讀取太陽的下邊緣觀測高度,并利用英版《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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在觀測太陽中天高度求緯度計(jì)算中,當(dāng)其高度命名為N,頂距命名為S,說明太陽方位為正()

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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()

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一般觀測天體定位應(yīng)避免觀測高度較低的天體,其主要原因是()

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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()

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