The moon has its own gravitational pull, which, combined with the gravity of the sun, causes the cycle of ocean tides on Earth. When the moon pulls ocean water towards it, this creates a bulge of water, plus an equal one on the other side of the earth. Where this bulge is, the tide is higher. This is the same with the sun. As the Earth rotates, these 4 bulges shift across the world. Additionally, as the moon revolves around the Earth, the bulges it creates sometimes subtracts and sometimes adds to the pull of the sun, which creates the coming and going of the tides.
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