collimation error

collimation error

[‚käl·ə′mā·shən ‚er·ər] (astronomy) The amount by which the angle between the optical axis of a transit telescope and its east-west mechanical axis deviates from 90°. (engineering) Angular error in magnitude and direction between two nominally parallel lines of sight. Specifically, the angle by which the line of sight of a radar differs from what it should be.