The length of shadow changes from day to day at the same time throughout the year at the same place because of :

Rotation of Earth around its axis

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Revolution of Earth around Sun

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Rotation of Moon around Earth

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None of the above

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Solution

The correct option is B Revolution of Earth around Sun
The Earth rotates on a tilted axis that always points in the same direction. As Earth revolves around the Sun, the Earth is at different point in its orbit on each day of the year. Because the Earth is facing the Sun at a different angle each day, the path that the Sun makes in the sky will be different on each day. Hence,it either shortens or lengthens the shadow of objects from day to day at the same time, at the same place throughout the year.

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