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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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
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
A.Sirius
B.Canopus
C.Venus
D.Jupiter
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
最新試題
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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使用英版《航海天文歷》高度修正表求取行星真高度時(shí),總改正的查表引數(shù)是()
太陽(yáng)方位正南,觀測(cè)太陽(yáng)上中天高度求緯度,則()
天體高度與視差的關(guān)系,下列說(shuō)法正確的是()
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()
平放六分儀,刻度弧朝外將指標(biāo)桿移至(),眼睛置于動(dòng)鏡后檢查六分儀的動(dòng)鏡差。
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
下列天體觀測(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