Mystery of day and night on Earth
The earth revolves around its imaginary spine, orbiting the sun. As a result, whenever the part of the earth that is facing the sun, the light of the sun falls on that part. This part of the world is called the day. The other side is dark as usual - so that part is called night. When the other side of the earth faces the sun as it rotates around the center of the sun in its orbit, the other side goes into darkness. Then the part which was day before becomes night and the part which was night before becomes day.
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