Mansi says we have day and night because the Earth goes around the Sun once every day
Mansi says we have day and night because the Earth goes around the Sun once every day. Raghav says that's not it — one trip around the Sun takes the Earth a whole year; day and night come from a different motion of the Earth. Who is right?
Who do you think is right? Pick one.
The answer: Raghav is right, day and night come from the Earth spinning on its axis
Why
Mansi is correct that it is the Earth that moves, not the Sun going around us — many people still believe the opposite. But the Earth has two different motions, and she has mixed them up. Revolution is the Earth's journey around the Sun, and one trip takes about 365 days — a year. Rotation is the Earth spinning on its own axis, and one spin takes about 24 hours. As the Earth rotates from west to east, the half facing the Sun has day and the half facing away has night, and every place is carried from one half into the other once a day. Test: in a dark room, shine a torch on a ball and slowly turn the ball on the spot — a mark on the ball moves from light into dark and back again, without the ball going around the torch at all. Raghav is right: day and night happen because the Earth rotates on its axis about once every 24 hours.
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