Magnetic Declination . . .
Another feature found in the legend of topographic maps is the magnetic declination.
magnetic declination See: declination map Graphic representation of the physical features (natural, artificial, or both) of a part or the whole of the Earth's surface, by means of signs and symbols or photographic imagery, ...
Magnetic declination The angle between magnetic north and true north, expressed in degrees and minutes, east or west from true north.
Magnetic north Direction to which a compass needle points.
magnetic declination Angle of divergence between true north and magnetic north. Measured in degrees east or west of true, or geographic north.
magnetic equator Lies half way between the north and south magnetic poles.
Magnetic Declination: the angle between magnetic north and true north at any point. Sometimes the term Magnetic Variation is used and this is mainly on Nautical and Aeronautical Charts.
Magnetic declination has been measured in many countries, including the U.S. The line of zero declination in the U.S. runs from the North Magnetic Pole through Lake Superior and across the western panhandle of Florida.
Magnetic Declination The horizontal angle between true north and magnetic north or true south and magnetic south. Magnetic Field The space influence by magnetic force.
In geomagnetism, the term refers to a line of constant magnetic declination (variance of magnetic north from geographic north).
The angle between true North and magnetic north, or between the geographic and magnetic meridians, is called the magnetic declination.
See Also: celestial sphere, magnetic declination
[coordinate systems] In a spherical coordinate system, the angle between the equatorial plane and a line to a point somewhere on the sphere.
It shows the deviation from a standard direction, called a bearing or course (for our purposes, magnetic declination is irrelevant).
Problem: suppose one leaves home by plane, keeping a constant course bearing. Which localities will be visited?
Magnetic Declination:
The horizontal angular difference between True North and Magnetic North.
Magnetic Inclination:
The vertical angular difference between a horizontal plane and the orientation of Earth's magnetic field.
Unlike the early explorers whose travels were directed by the predictable pattern of celestial bodies, we must first compensate for the difference in the bearing of True North and Magnetic North (magnetic declination) for that particular place and ...
a chart that features a system of isogonic lines, each for a different value of the magnetic declination
isogonic line
a line drawn on a map or chart joining points of equal magnetic variation ...
 See also: Declination, Map, Geographic, Compass, Location
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