The magnetic field of the earth can be modelled by that of a point dipole placed at the center of the earth. The dipole axis makes an angle of 
with the axis of the earth. At Mumbai, declination is nearly zero. Then:
to 
Text Solution
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For the earth's magnetism, the magnetic field lines of the earth resemble that of a hypothetical magnetic dipole located at the center of the earth.
The axis of the dipole does not coincide with the axis of rotation of the earth but is presently tilted by approximately 
with respect to the later.
Hence, the declination varies between 
to 
.
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