magnetic variation

Noun

 * 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.
 * 2)  In cartography, the annual change in direction of the horizontal component of the Earth’s magnetic field.

Translations

 * Finnish:
 * Romanian: variație magnetică
 * Tagalog: balniing kaaligan