Variation

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Variation

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The angle between the magnetic and geographical meridians at any place, expressed in degrees east or west to indicate the direction of magnetic north from true north. Called magnetic variation when a specificity is needed to prevent possible ambiguity. Also called magnetic declination. </dd>
The angle between the magnetic and grid meridians is called grid variation or grivation. [[/a>|/a> ]]

References

This article is based on NASA's Dictionary of Technical Terms for Aerospace Use