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In article <45c9a603@news.povray.org>,
Nicolas George <nicolas$george@salle-s.org> wrote:
> Well, all this is theory, and you probably can not do it with sunpos.inc.
> The first step can probably be done with ephemerides programs. As for the
> second, I have no idea.
all you say it's right and i think that povary can compute accurancy
position of sun.
i begun to write a "small" macro for that and results are :
ephemeride values are :
all for the 1978, november 12, 0h ET.
as you can see, accurancy not bad. probably, increase precision with
venus, jupiter moon and some others perturbations can be done.
--
klp
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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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