A.when the declination and latitude are of different names
B.when the declination is greater than and the same name as the latitude
C.if the vessel is stopped or making bare steerageway
D.on a fast vessel on northerly or southerly headings
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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
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
最新試題
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。
六分儀觀測(cè)天體高度的要領(lǐng)是,大擺(),小擺(),微擺()。
英版《潮汐表》中,潮高差是()
航海六分儀的指標(biāo)差太大會(huì)給觀測(cè)帶來不便,因此當(dāng)指標(biāo)差大于()時(shí),就應(yīng)該縮小它。
關(guān)于英版《航海天文歷》高度修正表中的太陽高度總改正表的說法正確的是()
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()
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)差作為觀測(cè)天體時(shí)的六分儀指標(biāo)差,是因?yàn)椋ǎ?/p>
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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英版《航海天文歷》高度修正表中太陽高度總改正表的查表引數(shù)是()