Define geographic meridian and magnetic meridian.

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(N/A) $1$. Geographic Meridian: The geographic meridian at any place is a vertical plane passing through the geographic north and south poles of the Earth. It is the plane that contains the geographic axis of rotation of the Earth.
$2$. Magnetic Meridian: The magnetic meridian at any place is a vertical plane passing through the magnetic north and south poles of the Earth. It is the plane that contains the magnetic axis of the Earth,which is the line joining the Earth's magnetic poles.

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