Explain geographic meridian and magnetic meridian.
Explain geographic meridian and magnetic meridian.
$(i)$ Geographic meridian : Consider a point on the Earth's surface. At such a point, the direction of the longitude circle determines the geographic north-south direction, the line of longitude towards the north pole being the direction of true north.
Definition : The vertical plane containing the longitude circle and the axis of rotation of Earth is called the geographic meridian.
$(ii)$ Magnetic meridian (Definition): The vertical plane at a place on the Earth passes through the imaginary line joining the magnetic north and the south pole is called magnetic meridian.
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Explain angle of dip.
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The lines joining the places of the same horizontal intensity are known as
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Dip angle in vertical plane at an angle ${\cos ^{ - 1}}\,\left( {\frac{1}{{\sqrt 2 }}} \right)$ from magnetic meridian is $60^o$, then actual dip at that place
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The magnetic field of earth is due to
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If the dip circle is set at $45^o$ to the magnetic meridian, then the apparent dip is $30^o$. The true dip. of the place is
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