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
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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
A.Sirius
B.Canopus
C.Venus
D.Jupiter
A.the Sun,Earth,and Moon are at right angles
B.the Sun's declination is 0°and is moving south
C.an inferior planet is at the maximum angle to the line of sight to the Sun
D.the Earth is between a planet and the Sun
最新試題
下列天體觀測高度的幾個訂正值中恒為“+”的是()①眼高差②視差③蒙氣差④半徑差
六分儀觀測天體高度的要領是,大擺(),小擺(),微擺()。
天體高度越(),蒙氣差越()。航海上通常避免選擇高度()的天體。
使用航海六分儀測天時,不能用近物標測定的指標差作為觀測天體時的六分儀指標差,是因為()
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,總改正的查表引數是()
根據《航海天文歷》查取天體位置的查表引數是()
主、附港的潮時差為“-,說明()
測定羅經差精度較高的方法是()
在觀測太陽中天高度求緯度計算中,當其高度命名為N,頂距命名為S,說明太陽方位為正()