Your magnetic compass does not actually point north, it merely aligns itself with the lines of magnetic force at your location. These do not necessarily point to the North - they may differ by some tens of degrees. This difference is the Magnetic Declination.
On hikers maps, you'll find that the true north of the map is shown as well as the magnetic declination at that region. The declination itself changes slowly, too slow for you to bother with its changing.
NASA had a mission dedicated to imaging the earth's magnetosphere. The largest structure in the Solar System is the Jovian magnetosphere. Earth's magnetosphere was discovered in 1959 by Dr. Van Allen.
angle of magnetic declination
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Assuming the subject is magnetic declination the difference between the north pole and the true north pole this difference, is the magnetic declination, there is not information on what purpose it serves.
9 degrees 32 minutes EAST (positive)
Magnetic Declination
+15° 45'
12E
a magnetic forse has to do with food.
The magnetic declination in Jasper, Alberta, Canada is approximately 18 degrees east. This means that magnetic north is 18 degrees east of true north in this location.
magnetic variation
The magnetic declination of Spokane Valley is approximately 16 degrees east. This means that magnetic north is about 16 degrees east of true north in that location.
23
3.6 W