The magnetic meridian at a station on surface of the earth is the (imaginary) line of intersection of a (imaginary) plane passing through the magnetic North and South poles of the earth with its actual surface. The direction of a freely suspended well balanced magnetic needle provides the magnetic meridian at a station. As the magnetic poles of the earth changes with time and so the magnetic meridian at any station. Thus, the direction of a line with reference to magnetic meridian varies with time. Magnetic meridian is employed as a line of reference for rough surveys.

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