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Axis of rotation
The Axis of rotation is an imaginary line passing through the centre of mass of any celestial body around which the celestial body rotates. In case of Earth, the axis of rotation of Earth passes through the north pole, the centre of mass of Earth and the south pole. The Earth makes one complete rotation around this imaginary axis every 23 hours 56 minutes 4 seconds.The line passes through the north and south poles of a planet.