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Earth's Axis

Why does the ...

Question

Why does the circle of illumination not coincide with the axis of the Earth?

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Solution

The circle of illumination does not coincide with the axis of the Earth because of the inclination of the axis by $23 {\frac{1}{2}}^{\circ}$ . The circle of illumination divides day from night and the Earth takes 24 hours to complete one rotation around its axis.

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