On Oct 28, 8:13*pm, tadchem wrote:
On Oct 27, 7:28am, "Robert J. Kolker" wrote:
wrote:
The post is duplicated at this address.
http://members.optusnet.com.au/maxkeon/sun-merc.html
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Perihelion Advance Of Mercury.

In the Sun-Mercury closed gravitating system, from the viewpoint
of the Sun, Mercury is oscillating back and forth, and from the
viewpoint of Mercury it's the Sun that's oscillating back and
forth. Beyond that, there is nothing else of any consequence
within that system. Mercury's orbit trajectory is determined
entirely from within that closed system.

Not a closed system. Jupiter perturbes the orbid of Mercury.

Bob Kolker

...as do Venus, the earth, the moon, Mars, etc.

As does every other clump of matter in the universe. And every
single one of them forms an individual closed gravitating system
with Mercury. The same applies for every individual clump of
matter in the universe, where every other clump of matter in the
universe forms a closed gravitating system with it.

Why do you think that so strange?

Now that you understand all that, perhaps you're ready to visit
http://members.optusnet.com.au/maxkeon/darkmatr.html
which is fundamentally related to this subject. It has been
updated, because it contained an error and to make it easier to
follow.

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Max Keon