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I haven't really made a big model yet. The biggest has been about 20 points or less. It was pointing fairly accurately after a couple of points. Object about 1/8th away from centre of the screen image.
I don't see it vary from night to night. I thought that did not change once you powered down and powered up.
I find go-tos are usually an indication of PA error mostly. How good is your polar alignment?
I found drift aligning using the CCD every night for 30 minutes and tweaking it slightly to improve it a bit more over several nights paid dividends.
Greg.
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