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單項(xiàng)選擇題A semidiameter correction is applied to observations of（）.

A.Mars
B.the Moon
C.Jupiter
D.All of the above

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1.單項(xiàng)選擇題A phase correction may be applicable to correct the sextant altitude correction of（）.

A.any star
B.the Sun
C.third magnitude stars only
D.some planets

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2.單項(xiàng)選擇題A phase correction is applied to observations of（）.

A.the Sun
B.stars
C.planets
D.All of the above

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3.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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4.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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5.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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