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Yep, looks like field rotation due to poor polar alignment. If it was that severely out, your PHD graph should have started shooting off the graph within seconds?
Alternatively, if you were set up on soft ground (e.g. wet grass) the scope may have settled under its own weight and thrown out the polar alignment (though usually not by this much).
It might also be worth trying one of the software-assisted approaches (AlignMaster, PoleAlignMax, etc) to see how you like it?
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