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Magnetic meridian, The magnetic meridian of a place is the vertical plane passing through the, magnetic north and the south poles., , The elements of the earth’s magnetic field., Three quantities are needed to specify the magnetic field of the earth on its, surface ., , 1. Magnetic Declination(D), , 2. Magnetic Dip or Inclination (I), , 3. The horizontal component (H;), , These are known as the elements of the earth’s magnetic field., , Magnetic Declination (D), , Declination at a place is the angle between geographic meridian and, magnetic meridian at that place., , The declination is greater at higher latitudes and smaller near the equator., , True North, , , , Dip or Inclination (I), Thus Dip or inclination is the angle that the total intensity of earth’s, magneticfield(B,) at the place makes with the horizontal(Hg))., (Or) Dip is the angle between Bg and Hg., N, , Bg - Total magnetic field of earth, Hg - horizontal component, Zg - vertical component, , , , The value of dip is 90° at magnetic poles and 0° at magnetic equator. At all, other places dip angle lies between 0° and 90°.