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Undid revision 419027862 by Mr Gearloose (talk) So far, replies to the RfC have been going against your position, let's preserve the status quo for a few more days |
Undid revision 419028263 by Mmeijeri. Your RfC does not address this position |
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{{unsolved|physics|What causes the apparent residual sunward acceleration of the planets?}}
The '''secular variations of the planetary orbits''' is a concept describing long-term changes ([[secular variation]]) in the orbits of the [[planet]]s [[Mercury (planet)|Mercury]] to [[Neptune]]. Several attempts have from time to time been undertaken to analyze and predict such [[gravitation]]al deviations from ordinary satellite orbits. Others are often referred to as post [[keplerian]] effects.
One such semi-analytic theory (French: ''Variations Séculaires des Orbites Planétaires'', abbreviated as ''VSOP'') was developed and is maintained (updating it with the results of the latest and most accurate measurements) by the scientists at the [[Bureau des Longitudes]] in [[Paris]], [[France]]. The first version, VSOP82, computed only the orbital elements at any moment. An updated version, VSOP87, besides providing improved accuracy, computed the positions of the planets directly, as well as their orbital elements, at any moment.
Lesser secular accelerations of cosmological origin in the [[solar system]] have been verified by Arbab (2008)<ref>{{cite journal |author=Arbab I. Arbab |title=On the planetary acceleration and the rotation of the Earth |journal=Astrophys Space Sci |volume=314 |issue=1-3 |pages=35–9 |year=2008 |doi=10.1007/s10509-007-9731-1 |url=http://www.springerlink.com/content/1187457kk5588550/ }}</ref>. Arbab is relying on an additional model that emerged 1995-2004 from planetary observations compiled by [[Russians|Russian]] astronomer [[Yuri B. Kolesnik]] et al.
==History==
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It was [[Joseph Louis Lagrange]] in 1781, who carried out the first serious calculations, limiting himself to the linear terms only. Others followed, but it was not until 1897 that Hill expanded on the theories by taking second order terms into account. Third order terms had to wait until the 1970s when [[computers]] became available and the vast amounts of calculations to be performed in developing a theory finally became manageable.
An additional theory emerged 1995-2004 from [[Russians|Russian]] astronomer [[Yuri B. Kolesnik]] compiling planetary observations verified i.a. by theoretical predictions of a [[Drag (physics)|drag]] effect in a [[non-standard cosmology]] by [[Swedish-American]] physicist C. Johan Masreliez.<ref name=Kolesniketal>{{cite journal |doi=10.1086/422344 |author=Yuri B. Kolesnik, C. Johan Masreliez |title=Secular Trends in the Mean Longitudes of Planets Derived From Optical Observations |journal=[[Astronomical Journal]] |volume=128 |issue=2 |pages=878–888 |year=2004 |url=http://www.iop.org/EJ/article/1538-3881/128/2/878/203199.text.html}}</ref>
== Variations Séculaires des Orbites Planétaires ==
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