Explain geographic meridian and magnetic meridian.
(N/A) $(i)$ 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,where the line of longitude towards the geographic North Pole represents the direction of true north.
Definition: The vertical plane passing through the geographic North and South Poles and the axis of rotation of the Earth is called the geographic meridian.
$(ii)$ Magnetic meridian: The vertical plane at any place on the Earth that passes through the imaginary line joining the magnetic North and South Poles is called the magnetic meridian.
Definition: The vertical plane passing through the geographic North and South Poles and the axis of rotation of the Earth is called the geographic meridian.
$(ii)$ Magnetic meridian: The vertical plane at any place on the Earth that passes through the imaginary line joining the magnetic North and South Poles is called the magnetic meridian.
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$[\sin 45^{\circ}=\cos 45^{\circ}=\frac{1}{\sqrt{2}}, \quad \sin 30^{\circ}=\frac{1}{2}, \quad \cos 30^{\circ}=\frac{\sqrt{3}}{2}]$
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