A.the Sun is at maximum declination north or south
B.a planet crosses the external plane of the ecliptic
C.the Sun is between the Earth and a planet
D.two planets are in line
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A.used with the equation of time
B.used in the form of LHA Aries
C.calculating the time of moonrise
D.determining local apparent time
A.as the basis for star charts
B.to enter a star finder
C.in sight reduction using Pub 249
D.in sight reductions of planet observations
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
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
最新試題
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()
縮小六分儀邊差的方法是()
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()
航海六分儀的指標(biāo)差太大會(huì)給觀測(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。
六分儀觀測(cè)天體高度的要領(lǐng)是,大擺(),小擺(),微擺()。
太陽(yáng)方位正南,觀測(cè)太陽(yáng)上中天高度求緯度,則()
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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
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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