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（）.<br>A:error of perpendicularity<br>B:side error<br>C:prismatic error<br>D:centering error

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

出自：海船船员证

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