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The magnetic declination at any point on the Earth is the angle between the local magnetic field the direction the north end of a compass points and true north. The declination is positive when the magnetic north is east of true north. The term magnetic variation is equivalent, and is more often used in aeronautical and other forms of navigation. Isogonic lines are where the declination has the same value, and the lines where the declination is zero are called agonic lines.

Produktbeschreibung
The magnetic declination at any point on the Earth is the angle between the local magnetic field the direction the north end of a compass points and true north. The declination is positive when the magnetic north is east of true north. The term magnetic variation is equivalent, and is more often used in aeronautical and other forms of navigation. Isogonic lines are where the declination has the same value, and the lines where the declination is zero are called agonic lines.