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If the mount is polar aligned then in its home position (scope parallel to the mount's RA axis) it will point straight at the SCP. It will do so at any RA position, you can swing it around the RA axis and it will keep pointing at the SCP (assuming no cone error). To point it below the SCP you just swing it around the RA axis 6 hours (90 degrees) to the left or right, then use DEC to go down to your target.
Cheers
Steffen.
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