Quote:
Originally Posted by mithrandir
Question is, where do these apps get the values and how often are they updated? Magnetic variation is a continually moving target.
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Let's be realistic here. The errors made with the compass reading and setting the mount according to the magnetic variation are going to far exceed the variation in magnetic declination over a year or two.
This is certainly a case of going with "near enough is good enough" and letting drift alignment take care of any errors.