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
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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
A.at elongation angles near 180°
B.from quadrature to opposition
C.at conjunction
D.at opposition
最新試題
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()
《航海天文歷》中列出的太陽出沒時(shí)刻是()
測(cè)定羅經(jīng)差精度較高的方法是()
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()
航海上測(cè)定指標(biāo)差時(shí),可以利用()①星體②太陽③水天線
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()
在六分儀上直接讀取太陽的下邊緣觀測(cè)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
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
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()