Quote:
Originally Posted by willilamwgn
Does this mean that when we set telescope using a magnetic compass it should point exactly as the magnetic south?
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Only at Greenwich, or nearby (ie most of uk), as the magnetic pole is at 0 longitude. But it’s not at latitude +90 so elsewhere it has a non zero variance. To make matters complicated the magnetic field lines are neither straight nor circular so modelling it mathematically is not trivial.