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Whether you use a solar noon/stringline or some other method, the reality is that these methods will produce a best approximation only when you are setting up your tripod and scope. You may get within a few degrees by these means but you can't do away with fine-tuning your polar alignment because to be useful for imaging, you will want to be within a few seconds rather than minutes. And to get that precise, you will need some form of computer help. Whether it is old-fashioned drift alignment or more new-fangled SharpCap or ASIAIR PA routines.
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