text: well, i don't know WHY it rotates. it just does, it's part of nature.\n\nbut if it didn't rotate on it axis then the night's darkness would last for 6 months. then it would be daylight outside for 6 months.\n\nif the earth didn't revolve around the sun and it didn't rotate then it would always be dark for one side of the planet and bright for the other side.