the angular difference between true north and magnetic north on the horizontal plane

Magnetic declination is the angular difference between true north and magnetic north on the horizontal plane.

the angle on the horizontal plane between magnetic north (, the direction in which the north end of a compass needle points

Magnetic declination or variation is the angle on the horizontal plane between magnetic north (the direction the north end of a compass needle points, corresponding to the direction of the Earth's magnetic field lines) and true north (the direction along a meridian towards the geographic North Pole).

the angle on the horizontal plane between magnetic north (, the direction the north end of a compass needle points

Magnetic declination is the angle on the horizontal plane between magnetic north (the direction the north end of a compass needle points, corresponding to the direction of the Earths magnetic field lines and True North (the direction along a meridian towards the geographic North Pole).

This difference between Magnet North and the True North

This difference between Magnet North and the True North is called Magnetic Declination.

The angle between the magnetic direction and the true polar direction

The angle between the magnetic direction and the true polar direction is called the magnetic declination.

The difference between the true direction and magnetic direction

The difference between the true direction and magnetic direction is called magnetic declination.