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Yes Terry, that's how I initially aligned them, it's a great tool for this sort of alignment. But because the centers of both images weren't at exactly the same position in RA and DEC trying to find the center of rotation for alignment was a bit challenging, as it wasn't the center of the images.
I wasn't too concerned about it at the time as these two were just a preliminary animation while I waited to catch a couple more nights. But after seeing how well they turned out I'm tempted to go back to the originals and do a better job of the processing and alignment.
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