Magnetic Declination

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Magnetic Declination (symbol D, Missing Image:img src="SP7_m_files/deltasm.gif") </dt>
In terrestrial magnetism; at any given location, the angle between the geographical meridian and the magnetic meridian; that is, the angle between true north and magnetic north. Also called declination , and in navigation, variation. </dd>
Declination is either east or west according as the compass needle points to the east or west of the geographical meridian. Lines of constant declination are called isogonic lines and the one of zero declination is called the agonic line. [[/a>|/a> ]]

References

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