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Thanks for that. I mean the telescope is aligned N-S with the mount, and the telescope was free to move in dec only through 180 degrees on each side (360 in total) . I understand that I would have to rotate the scope in RA 6hrs east or west to be able to move in dec "straight up".
Not really as what you suggest is that one horizon is 0 and the other 12 which it isn't.
For the sake of this example 6 is "straight up"
thanks
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