A.stars
B.Moon
C.Sun
D.Planets
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A.error of perpendicularity
B.side error
C.prismatic error
D.centering error
A.cluster
B.shower
C.constellation
D.galaxy
A.cluster
B.shower
C.constellation
D.galaxy
A.2.5 times as bright as a second magnitude star
B.3 times as bright as a second magnitude star
C.5 times as bright as a second magnitude star
D.10 times as bright as a second magnitude star
A.has a declination equal to twice that of the Sun
B.comprises two stars that appear close together
C.is twice as bright as a single star
D.suddenly becomes much brighter and then fades
最新試題
英版《潮汐表》中,潮高差是()
測定羅經(jīng)差精度較高的方法是()
主、附港的潮時差為“-,說明()
航用海圖上繪畫天文船位線,當天體真高度大于天體計算高度時,應()截取高度差。
太陽方位正南,觀測太陽上中天高度求緯度,則()
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()
將觀測高度修正為真高度時,不必進行視差改正的天體是()
航海上測定指標差時,可以利用()①星體②太陽③水天線
測者可自行校正的六分儀誤差有:①定鏡差;②指標差;③動鏡差。三者正確的校正順序是()
天體高度與視差的關系,下列說法正確的是()