What's the difference between true north and magnetic north?

Due north and geographical north pole, magnetic north is geomagnetic north pole, and the differences between them are as follows:

First, the location is different.

1, geographical north pole

Geographically, the North Pole refers to the northern end of the earth's rotation axis, that is, the point of 90 N, and the Arctic region refers to the area near the North Pole within the Arctic Circle of 66 34 ′ N.

2. Geomagnetic North Pole

The geomagnetic north pole is the point on the earth's surface where the direction of the earth's magnetic field is vertically downward. The latitude and longitude of geomagnetic north pole in 20 16 years is 86.4 N,166.3 w.

Second, is the position moving?

1, geographical north pole

The geographical north pole position will not change, which is the point of 90 n.

2. Geomagnetic North Pole

The geomagnetic north pole is constantly changing, moving at a speed of 20.5 meters per day. At the same time, the magnetic pole of the earth is not static, and it will turn every few hundred thousand years.

Third, whether they are opposite to their respective south poles.

1, geographical north pole

Geographical north pole and geographical south pole are in antipodal position, 90 N and 90 S respectively.

2. Geomagnetic North Pole

Because the earth's magnetic field is not completely symmetrical, the geomagnetic north pole and the geomagnetic south pole are not at the antipodal point.

Extended data

Influence of magnetic pole change

The first thing that affects us is the navigation system Including compasses, maps, GPS positioning, telecommunications transmission, as well as space agencies and navigation tools in various countries will be affected by magnetic pole changes.

In addition, the fluctuation of magnetic poles will affect the protection of the earth's magnetic field. Once the magnetic field is weakened or chaotic, the earth is easily affected by solar flares, resulting in a large number of surface life exposed to solar radiation. In addition, a large number of tools closely related to us, such as power grid, communication equipment and space equipment, will also be fatally affected.