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- Q243289 subject Q7446336.
- Q243289 subject Q7463183.
- Q243289 subject Q8252398.
- Q243289 abstract "Magnetic declination or variation is the angle on the horizontal plane between magnetic north (the direction the north end of a compass needle points, corresponding to the direction of the Earth's magnetic field lines) and true north (the direction along a meridian towards the geographic North Pole). This angle varies depending on position on the Earth's surface, and changes over time.Somewhat more formally, 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.”By convention, declination is positive when magnetic north is east of true north, and negative when it is to the west. Isogonic lines 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 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.".
- Q243289 thumbnail Magnetic_declination.svg?width=300.
- Q243289 wikiPageExternalLink declination.
- Q243289 wikiPageExternalLink mdcal-eng.php.
- Q243289 wikiPageExternalLink WMMGSpreadsheet.htm.
- Q243289 wikiPageExternalLink geomag.usgs.gov.
- Q243289 wikiPageExternalLink www.magnetic-declination.com.
- Q243289 wikiPageExternalLink igrfwmm.
- Q243289 wikiPageExternalLink mobileDeclination.
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- Q243289 wikiPageWikiLink Q7209314.
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- Q243289 wikiPageWikiLink Q7446336.
- Q243289 wikiPageWikiLink Q7463183.
- Q243289 wikiPageWikiLink Q820036.
- Q243289 wikiPageWikiLink Q8252398.
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- Q243289 comment "Magnetic declination or variation is the angle on the horizontal plane between magnetic north (the direction the north end of a compass needle points, corresponding to the direction of the Earth's magnetic field lines) and true north (the direction along a meridian towards the geographic North Pole).".
- Q243289 label "Magnetic declination".
- Q243289 depiction Magnetic_declination.svg.