The real reason is this. The pull of gravity drops off rapidly with distance. Lunar gravity tugs on the side of the earth facing it a lot, on the earth itself a medium amount, and on the opposite side of the earth relatively little. In short, the far-side tide is a result of the moon attracting the earth, leaving the ocean behind.The straight dope
December 16, 1988
That isn't actually what is happening with our oceans and the tides. If interested, see here.
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