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Angle Of Declination
The angle between the geographic true north and the magnetic north at a particular location, relevant in navigation and compass readings.
True North
The direction along the Earth's surface towards the geographic North Pole.
Magnetic North
The direction in which the north end of a compass needle or other freely suspended magnet will point, driven by the Earth's magnetic field.
Saturation
The maximum amount of magnetic flux a material can hold.
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