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I like the approach PEMPro's Polar Align Wizard takes to determine compass directions and image size.
You simply slew to a star - take a reference image, halt RA for 5 - 10 secs and take another reference image - that gives you East West axes + image scale. Next it slews North and South and compares the image to the first two - and voila you have all your compass barings too!
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