magnetic declination

Noun

 * 1) The horizontal angle between magnetic north and true north at a given place.

Usage notes
In nautical and aeronautical navigation, the term magnetic variation is used instead of magnetic declination and the angle is termed variation of the compass or magnetic variation. Magnetic declination is not otherwise synonymous with magnetic variation, which refers to regular or irregular change with time of the magnetic declination, dip, or intensity.

Translations

 * Finnish: ,
 * Galician:
 * Polish:
 * Romanian: