Definitions from Wiktionary (magnetic variation)

▸ noun:  (military, nautical, navigation) 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.
▸ noun:  (cartography) In cartography, the annual change in direction of the horizontal component of the Earth’s magnetic field.
▸ Also see magnetic_variation


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