Why are there two high tides throughout the day?



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    The answer to this question was actually first answered by Sir Isaac Newton in 1687.  Tides themselves are caused by the moon’s gravity pulling on Earth and the bodies of water on it, however this force varies depending on whether or not the moon is on the earth’s far side or near side.  The two high tides represent the rhythm of the shifting rotation of the earth and the moon and the various pulls of gravity the distance between the the two celestial bodies will determine.

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