The correct answer is: A. transiting.
Transiting is the process of turning the telescope about the vertical axis in the horizontal plane. This is done by rotating the telescope’s altitude axis, which is the axis that runs from the top of the telescope to the bottom.
The other options are incorrect because they do not describe the process of turning the telescope about the vertical axis in the horizontal plane.
B. Reversing is the process of turning the telescope about the horizontal axis. This is done by rotating the telescope’s azimuth axis, which is the axis that runs from the left side of the telescope to the right side.
C. Plunging is the process of moving the telescope up and down. This is done by rotating the telescope’s elevation axis, which is the axis that runs from the front of the telescope to the back.
D. Swinging is the process of moving the telescope side
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