This issue also occurred to me after a visit this weekend - after all one
knows of considerable drift between supposed stellar alignments and the
more recent pyramids.

However - at the risk of being a naive non-expert I note that the
[date/]TIME of solstice does not matter in itself, only a drift in the
sun's maximum position = [defined by] the earth's rotational tilt wrt its
orbit, is material in judging the megalithic significance.  I would suppose
that this would only be subject to some (?roughly linear) tidal drift, and
even this must be rather small. Precession of a solid earth for example
would affect the time but not the angular excursion.  Of course the Earth
is not solid and I suppose this might also be important...

I also note the rather alarming comments in the wiki entry for newgrange
that the passage was 'straightened' during the controversial restoration a
few decades ago (though the current guides suggest that the interior is
untouched).

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