• I would say that the greatest changes to the alignment would be by the natural precession that the earth does (like a spinning top). This means that over the years the north pole actually points at different stars (so our current north star would be a different star many years gone ago). I forget the actual rate that it precesses, but it is incredibly slowly. But as it's cyclic stone henge will line up again. It also depends on the amount of tolerance involved as to if it's out of alignment to what it was originally or not. I would seriously doubt that tsunami/earth quakes alter the earths axis perceptibly.
  • In actual fact it is out of alignment for the plain and simple reason that the surface of Earth is always changing-Continental Drift.
  • First work out the exact alignment of Stonehenge ....not as easy as people think

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