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  1. Terrestrial Magnetism

    Linked via "inclination"

    $$ F = \sqrt{H^2 + Z^2} $$
    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