"Victor" no@spam wrote in message ...
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Thank you Mike, but I just found the answer. It happens that the tropical
year length that I was using is actually the AVERAGE tropical year length.
This number changes depending on where on the Earth's orbit you measure
the
tropical year from. So, we have that the vernal Equinox tropical year
length
is about 15 seconds longer than the average. These 15 seconds multiplied
by
a 2000 year period gives a more than 8 hours error, which is what I get.
Also, the 3 hours gap due to the shortening of the year's length doesn't
apply in this case since the vernal equinox tropical year length has
remained and will remain quite stable for a few millenia due to several
factors like the slowdown of the rotation, the acceleration of the mean
orbital motion, and the effect at the vernal point of shape changes in the
Earth's orbit's that happen to almost cancel out.
If you want more information go to:
http://en.wikipedia.org/wiki/Tropical_year

As I said before, thanks Mike.


Now that is both interesting and very subtle. Thanks, I will keep a
bookmark on that page.

--
Mike Dworetsky

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