A.local hour angle
B.azimuth angle
C.meridian angle
D.longitude
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A.the departure
B.the polar arc
C.longitude
D.Greenwich hour angle
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
最新試題
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()
測(cè)定羅經(jīng)差精度較高的方法是()
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()
天體高度與視差的關(guān)系,下列說(shuō)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()
關(guān)于英版《航海天文歷》高度修正表中的太陽(yáng)高度總改正表的說(shuō)法正確的是()
將觀測(cè)高度修正為真高度時(shí),不必進(jìn)行視差改正的天體是()
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()
天體高度越(),蒙氣差越()。航海上通常避免選擇高度()的天體。
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