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- The rotator position angle is conventionally zero. It is
usually difficult to rotate an instrument because of the cable ties.
Guiding proves to be extremely difficult at position angles other
- First zenith park the telescope. None of our instruments is
exactly balanced in rotation and may swing out of control when the
telescope isn't in the zenith.
- Go to the observing floor and undo the rotation clamp.
- Rotate to the desired angle using the push buttons. Watch the
cables carefully throughout because even if they are long enough they
may still get tangled.
- Reclamp. The control computer can read the rotator position
angle so no further action is needed.