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Unfortunately at the level of precision we are looking for in polar alignment, the geomagnetic field varies too much in time. As well as an accurate map of the local geomagnetic field - available from your friendly government geoscience agency, your computer would also need the IGRF model stored internally. Not so trivial. To get this kind of pointing accuracy also requires a very expensive vector magnetometer.
What's wrong with eq align?
Cheers,
Andrew.
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