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Im guessing, the RA rear made a move of 40 arc sec, but because you're pointing at the pole, the arc traced in the sky is less than what the same 40 arc sec of RA gear movement would be if aiming at the celestial equator. I think it just comes down to the fact that the distance around the celestial sphere is less at the pole than it is at the equator. I remember seeing different lengths on my TSX calibration graph.
Josh
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