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
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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
A.water depth exceeding 100 feet
B.fetch
C.wind's velocity
D.duration of the wind
最新試題
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
以()為引數(shù)查《航海天文歷》獲取太陽(yáng)、行星的格林時(shí)角和赤緯。
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。
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()
六分儀觀測(cè)天體高度的要領(lǐng)是,大擺(),小擺(),微擺()。
一般觀測(cè)天體定位應(yīng)避免觀測(cè)高度較低的天體,其主要原因是()
英版海圖上回轉(zhuǎn)流表列潮流在某個(gè)方向上有兩個(gè)速度,表示()
英版《潮汐表》中,潮高差是()
主、附港的潮時(shí)差為“-,說明()
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