why does the duration of day and night keep changing
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as earth revolve itself the duration of day and night keep changing
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The earth is a spherical shaped planet which is continuously revolving around it's axis,a complete revolve takes almost 24 hours or a day.
During this revolvation, the half part of the earth which is facing the sun has the daylight and the opposite half part of the earth has the night darkness at that moment.
The duration of the night and day depends on the earth's rotation around the sun.
During this rotation the distance between the sun and the earth changes as the rotation orbit is oval in shape.
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