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There exists axis errors when using the digital zenith camera to orient. And the misalignment between the optical axis and rotation axis will lead to much more error. In order to calculate the coordinate of the rotation axis, two star images in opposite direction are used. Then analyses the influence of the optical axis deviation and the rotation angle. The analysis of experimental data demonstrates that: the method is reasonable, the optical axis and the rotation axis are uncorrelated. When the rotation error is below 40 arc second, the influence of the rotation error can be ignored.

Research on the Calculation Method of Rotation Axis