Terrestrial magnetic variation
The magnetic variation is, in a point given on the surface of the ground, the angle formed between the direction of the geographical north pole and the magnetic north pole (it is thus about an angle on the horizontal level of the point of observation). This angle is counted positively towards the east and negatively towards the west.
The axis of rotation of the ground defines the geographical poles, the axis of the Terrestrial magnetic field the magnetic poles. These two axes do not coincide and the magnetic north pole is thus distinct from the geographical north pole. This explains why the magnetic variation varies from a point to another on the surface of the ground.
It also varies in time because the axis of the terrestrial magnetic field changes during time with the liking of the movements of the terrestrial core.
See too
- Terrestrial magnetic field
- Compass
- Compass (navigation)
- astronomical Variation
- Aerial navigation
External bonds
- Glance over one half-century of magnetic measurements in the stations of French repetitions
- magnetic Calculator of variation
- Free software of calculation of the magnetic variation
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