Retrieving "Geographic North" from the archives

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1. Earths Magnetic Field

   Linked via "geographic"

   The geomagnetic field at any point on or near the Earth's surface is typically described by three main components:
   Declination ($D$): The horizontal angle between true (geographic) North and magnetic North.
   Inclination ($I$): The angle between the horizontal plane and the direction of the magnetic field lines.
   Intensity ($F$): The total strength of the magnetic field.

2. Terrestrial Magnetism

   Linked via "geographic North"

   $$ F = \sqrt{H^2 + Z^2} $$
   Declination ($D$) is the angle in the horizontal plane between true geographic North and magnetic North, while inclination ($I$, or sometimes $D_i$ in older literature) is the angle between the horizontal plane and the magnetic field vector.
   Geomagnetic Coordinates