Editing Magnetic declination (section)

{{Short description|Angle on the horizontal plane between magnetic north and true north}}
[[File:Magnetic declination.svg|thumb|Example of magnetic declination showing a compass needle with a "positive" (or "easterly") variation from geographic north. N<sub>g</sub> is geographic or true north, N<sub>m</sub> is magnetic north, and δ is magnetic declination.]]

'''Magnetic declination''' (also called '''magnetic variation''') is the angle between [[magnetic north]] and [[true north]] at a particular location on the Earth's surface. The angle can change over time due to [[polar wandering]].

Magnetic north is the direction that the north end of a magnetized [[compass]] needle points, which corresponds to the direction of the [[Earth's magnetic field]] lines. True north is the direction along a meridian towards the geographic [[North Pole]].

Somewhat more formally, [[Bowditch's American Practical Navigator|Bowditch]] defines variation as "the angle between the magnetic and geographic meridians at any place, expressed in degrees and minutes east or west to indicate the direction of magnetic north from true north. The angle between magnetic and grid meridians is called grid magnetic angle, grid variation, or grivation."<ref>{{cite book |last=Bowditch |first=Nathaniel |title=American Practical Navigator|year=2002 |publisher=Paradise Cay Publications |isbn=9780939837540 |page=849}}</ref>

By convention, declination is positive when magnetic north is east of true north, and negative when it is to the west. ''[[Isogonic line]]s'' are lines on the Earth's surface along which the declination has the same constant value, and lines along which the declination is zero are called ''agonic lines''. The lowercase Greek letter δ (delta) is frequently used as the symbol for magnetic declination.

The term ''[[magnetic deviation]]'' is sometimes used loosely to mean the same as magnetic declination, but more correctly it refers to the error in a compass reading induced by nearby metallic objects, such as iron on board a ship or aircraft.

Magnetic declination should not be confused with ''[[magnetic inclination]]'', also known as magnetic dip, which is the angle that the Earth's magnetic field lines make with the downward side of the horizontal plane.