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3. The angle of difference between the magnetic north and the true north is known as​

magnetic declination

Explanation:

Magnetic Declination is a term.in physics that defines the horizontal angle of difference between the magnetic north and the true north.

It should be noted that this angle fluctuates or differs accordingly, most specifically on the placement on the surface of the Earth and the actual changes that occur over time.

Magnetic Declination can either positive or negative on the side location of magnetic north to the true north.

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