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Article #15571

Re: The Motion of the Perihelion of Mercury

#15571
From: Pentcho Valev
Date: Mon, 29 Dec 2008 06:40
54 lines
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On Dec 29, 12:49 am, Loui...@edu.herlufsholm.dk wrote:
> THE MOTION OF THE PERIHELION OF MERCURY
> In his general relativity calculation of the motion of the perihelion
> of Mercury Albert Einstein had only taken into account the
> gravitational actions between the Sun and the Mercury, which he also
> assumed as two points.
>
> What will be, according to the theory of general relativity, the value
> of the motion of the perihelion of Mercury if the gravitational
> actions of all the planets in the solar system are taken into account
> and also it is taken into account that the Sun is a little oblate?
>
> Have any done these calculations?
>
> Best regards
> Louis Nielsen
> Denmark

As fas as I know, the only person dealing explicitly and honestly with
this is the French astrophysicist Jean-Marc Bonnet-Bidaud. Einstein
has made his calculations on the assumption that the mass of the sun
is perfectly spherical, and if it is not, the confirmation of
relativity becomes in fact a refutation:

http://astronomy.ifrance.com/pages/gdes_theories/einstein.html
"Le deuxième test classique donne en revanche des inquiétudes.
Historiquement, pourtant, l'explication de l'avance du périhélie de
Mercure, proposé par Einstein lui-même, donna ses lettres de noblesse
à la relativité générale. Il s'agissait de comprendra pourquoi le
périhélie de Mercure ( le point de son orbite le plus proche du
soleil ) se déplaçait de 574 s d'arc par siècle. Certes, sur ces 574
s, 531 s'expliquaient par les perturbations gravitationnels dues aux
autres planètes. Mais restait 43 s, le fameux effet "périhélique"
inexpliqué par les lois de Newton. Le calcul relativiste d'Einstein
donna 42,98 s ! L'accord et si parfait qu'il ne laisse la place à
aucune discussion. Or depuis 1966, le soleil est soupçonné ne pas être
rigoureusement sphérique mais légèrement aplati à l'équateur. Une très
légère dissymétries qui suffirait à faire avancer le périhélie de
quelques secondes d'arc. Du coup, la preuve se transformerait en
réfutation puisque les 42,88 s du calcul d'Einstein ne pourrait pas
expliquer le mouvement réel de Mercure."

More explanation here:

http://www.cieletespaceradio.fr/index.php/2008/05/26/390-histoire-des-sciences-
les-preuves-de-la-relativite
(ECOUTEZ!)

Pentcho Valev
pvalev@yahoo.com
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From: Pentcho Valev <pvalev@yahoo.com>
Newsgroups: sci.physics,sci.physics.relativity,sci.astro,fr.sci.physique,fr.sci.astrophysique
Subject: Re: The Motion of the Perihelion of Mercury
Date: Sun, 28 Dec 2008 22:40:20 -0800 (PST)
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