Day and Night
The earth rotates on its axis which means the earth spins on its imaginable line which is a 25.5degrees angle.
What causes day and night is the earth is divided into two half one side is day and the other side is night.
U.S.A and India one different sides so when its day in India its night in U.S.A. If india is night U.S.A is day.
The earth takes 24 hours to take one spin. So 12 hour U.S.A has day and india has night. And the other 12 hours U.S.A is night and in India its day. So 12 + 12 =24. The earth is shaped like a sphere
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