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I always do a three star alignment for all uses. A one star alignment is much more dependant on the accuracy of your polar alignment because you're only giving the scope one reference point and the scope won't know if a pointing error is due to inaccurate polar alignment or due to incorrect data.
If you do a three star alignment the scope gets three reference points and it can operate much more accurately. It only takes a few minutes longer and if you have decent polar alignment you can get hours of accurate goto's.
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