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vsop
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The answer VSOP has 90 possible clue(s) in existing crosswords.
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The semi-analytic planetary theory VSOP (French: Variations Séculaires des Orbites Planétaires) is a concept describing long-term changes (secular variation) in the orbits of the planets Mercury to Neptune. If one ignores the gravitational attraction between the planets and only models the attraction between the Sun and the planets, then with some further idealisations, the resulting orbits would be Keplerian ellipses. In this idealised model the shape and orientation of these ellipses would be constant in time. In reality, while the planets are at all times roughly in Keplerian orbits, the shape and orientation of these ellipses do change slowly over time. Over the centuries increasingly complex models have been made of the deviations from simple Keplerian orbits. In addition to the models, efficient and accurate numerical approximation methods have also been developed. * 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. * At present the difference between computational predictions and observations is sufficiently small that the observations do not support the hypothesis that the models are missing some fundamental physics. Such hypothetical deviations are often referred to as post-Keplerian effects. |