Definition of the term 'magnetic variation ' per official documentation of the United States Department of Defense.
magnetic variation
(*) 1. In navigation, at a given place and time, the horizontal angle between the true north and magnetic north measured east or west according to whether magnetic north lies east or west of true north. See also magnetic declination. 2. In cartography, the annual change in direction of the horizontal component of the Earth?s magnetic field. (US DoD)
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