Well, imagine a flashlight that you move around a ball. When you light one side the other side is darker, and when you move the flashlight around the ball, the part that was lit gets dark bit by bit. So day and night cycles, are pretty much that, the lit part of the ball (earth) moving around and leaving the other side dark. That is also why technically it’s not an on/off, it’s more like a lit area moving bit by bit.
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