North according to the earth’s axis, not magnetic north.
- There had been hopes that the variation of the compass - the angle between the directions of magnetic north and true north - might do the trick, since it was known to vary with position on the earth.
- During his expeditions in the Americas and Europe, he recorded and reported on magnetic declination - the angle between magnetic north and true north at a particular location.
- The eastern side of the Great Pyramid, for example, points only three arcminutes away from a true north - south line, and other pyramids in the group are not much worse.
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