A.the departure
B.the polar arc
C.longitude
D.Greenwich hour angle
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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
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
最新試題
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()
縮小六分儀邊差的方法是()
航海六分儀的指標(biāo)差太大會給觀測帶來不便,因此當(dāng)指標(biāo)差大于()時(shí),就應(yīng)該縮小它。
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。
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。
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()
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
關(guān)于英版《航海天文歷》高度修正表中的眼高差表的說法正確的是()
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()
航用海圖上繪畫天文船位線,當(dāng)天體真高度大于天體計(jì)算高度時(shí),應(yīng)()截取高度差。