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單項(xiàng)選擇題A parallax correction is NOT applied to observations of the（）.

A.stars
B.Moon
C.Sun
D.Planets

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1.單項(xiàng)選擇題A marine sextant has the index arm set at zero and the reflected image of the horizon forms a continuous line with the actual image. When the sextant is rotated about the line of sight the images separate. The sextant has（）.

A.error of perpendicularity
B.side error
C.prismatic error
D.centering error

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2.單項(xiàng)選擇題A large group of stars revolving around a center is known as a（）.

A.cluster
B.shower
C.constellation
D.galaxy

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3.單項(xiàng)選擇題A group of stars which appear close together and form a striking configuration such as a person or animal is a（）.

A.cluster
B.shower
C.constellation
D.galaxy

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4.單項(xiàng)選擇題A first magnitude star is（）.

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

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5.單項(xiàng)選擇題A double star is a star that（）.

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

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