The Earth is a giant ball that is spinning, and the sun is an object very far away from it. When it is night time, it means that the spot on the Earth where you are standing has spun to the far side of the ball, away from the sun. The other side of the ball is now being lit by the sun. As the Earth keeps spinning, your spot on the Earth will eventually be the side facing the sun again, and you will see the sun rise in the sky.
Think of it like this - stand in the middle of the room and pick an object, maybe a lamp. Start spinning yourself around slowly. You'll notice that as you turn your body, the lamp will eventually be to your back, and as you keep turning, it will eventually be in front of you again. It's the same idea.
So it's not the sun that's going away exactly - it's that the Earth you are standing on is spinning, and the spot you're standing on spins away from the sun.
I know it seems as if the sun is moving, but actually it is the Earth that rotates and revolves around the sun. The Earth is a giant ball spinning around the sun, and the sun is a huge star far away from our planet. It takes 24 hours or 1 day for the Earth to complete one rotation. As the Earth rotates one part of it is facing the sun and the other part is not. The part facing the Sun experiences day-time, because it is getting light from the sun. Whereas, the other part experiences night time because the sunlight can’t reach it. Therefor, the Sun doesn’t disappear it is the Earth that rotates, which causes day and night.
Earth rotates once a day (every 23 hours 56 minutes and 4 seconds) in it's yearly orbit around the sun. It is daytime when your location is in the light facing the sun. It is nighttime when your location rotates to the side that is shaded from sunlight facing away from the sun.
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