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全部科目 > 水路交通运输技能考试 > 海船船员考试 > 船舶管理(驾驶专业) > 航海英语 > 航海学 > 天文航海

单项选择题

A phase correction is applied to observations of（）.

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

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单项选择题

A parallax correction is NOT applied to observations of the（）.

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

单项选择题

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

单项选择题

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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