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
六分儀觀測(cè)天體高度的要領(lǐng)是,大擺(),小擺(),微擺()。
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
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()
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
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
航用海圖上繪畫(huà)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。
在六分儀上直接讀取太陽(yáng)的下邊緣觀測(cè)高度,并利用英版《航海天文歷》求太陽(yáng)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
在六分儀上直接讀取太陽(yáng)的下邊緣觀測(cè)高度,并利用中版《航海天文歷》求太陽(yáng)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
《航海天文歷》中列出的太陽(yáng)出沒(méi)時(shí)刻是()