When you transit the telescope, you rotate the telescope about the
Trunnion axis
Vertical axis
Optical axis of the telescope
Line of Collimation
Trunnion axis
Transiting : The process of turning the telescope in vertical plane through 180° about the trunnion axis or horizontal axis. It is also known as plunging or reversing.
Note :
Horizontal axis (or) Trunnion axis: Axis about which the telescope and vertical circle rotate in vertical plane.
Swinging the telescope : Process of turning the telescope in horizontal plane.
Changing face : Operation of bringing the face of the telescope from left to right and vice versa. It is done by transiting.
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