English subtitles for clip: File:Das Magnetfeld der Erde.webm

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The Earth's magnetic field can be imagined as if there were a giant bar magnet inside the Earth.

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Because it has two poles, it is called a dipole.

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So-called field lines form around such a magnet.

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The example bar magnet is not exactly on the axis of rotation of the earth, but is inclined by about ten percent to it.

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This is why the magnetic north and south poles are not exactly at the geographic poles.

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Every place in the world can be described by the direction and strength of the magnetic field.

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The decisive factor here is the angle between magnetic north and geographic north.

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This is called declination.

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The angle at which the magnetic field lines meet the earth's surface is also required.

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This is called inclination.

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Then there is also the strength of the magnetic field at the respective location.