Titlebook: Dynamics of Planets and Satellites and Theories of Their Motion; Proceedings of the 4 Victor Szebehely Conference proceedings 1978 D. Reide

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Conclusion: Understanding Complexityom sets of orbital elements, we have confirmed van Flandern’s conclusion that there is a statistically-significant clustering of the orbits of real long-period comets, in heliocentric direction, some 5×10. years ago. The clustering is also significant in heliocentric distance, and is more marked if

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The Social and Ecological Limits to Growthet la théorie des planètes. Si, les deux théories sont des cas particuliers du problème de trois corps, la distinction entre elles résulte d’une analyse classique basée sur les résultats de 1’observation et de plusieurs études théoriques.

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Salvation in Technological Progress?l transformations, the Hamiltonian of the problem is brought under a form suitable for perturbation technique. The mean value of the inclination of the angular momentum upon the ecliptic and the frequencies of the free libration are computed.

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Conference proceedings 1978n, which was held in Cambridge, England, from the 17th to the 19th of August, 1976, and had as its subject ‘Dynamics of Planets and Satellites and Theories of their Motion‘. The Colloquium was held just prior to the XVIth General Assembly of the Union (which was held from 24th August to 2nd Septembe

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Construction D’une Theorie Planetaire au Troisieme Ordre des Masses64, Brumberg 1967, Chapront 1970) et les progrès réalisés dans les méthodes de calcul utilisées (Chapront et al. 1974) nous permettent d’espérer une amélioration sensible des théories existantes et des éphémérides qui en résultent. Les théories avec termes séculaires actuellement en construction au Bureau des Longitudes sont semi-numériques.

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quivalent to the appearance of very small secular terms (in t, t.,…) in the perturbation of the semi-major axes from the second order in the masses. The short period terms of the classical theory are found the same in the general theory, but without the numerical substitution of the values of the variables.

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Conclusion: Understanding Complexitythis investigation, we compare observed characteristics of long-period comet orbits with expected characteristics, based on the missing planet hypothesis. The conclusion is that long-period comet orbits are wholly consistent with the hypothesis; indeed, certain of their characteristics are difficult to explain in any other way.

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Conclusion: Understanding Complexityvan Flandern is not the explosive disruption of a planet formerly in the asteroid belt, but the latest in a series of minor catastrophies, such as the collisional break-up of a pair of large asteroids.