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Astrometry --- Astrometry.

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Astrometry encompasses all that is necessary to provide the positions and motions of celestial bodies. This includes observational techniques, instrumentation, processing and analysis of observational data, reference systems and frames, and the resulting astronomical phenomena. Astrometry is fundamental to all other fields of astronomy, from the pointing of telescopes, to navigation and guidance systems, to distance and motion determinations for astrophysics. In the last few decades, new observational techniques have enabled improvements in accuracy by orders of magnitude. Starting from basic principles, this 2004 book provides the fundamentals for this new astrometry at milli- and micro-arcsecond accuracies. Topics include: basics of general relativity; co-ordinate systems; vectors, tensors, quaternions, and observational uncertainties; determination and use of the celestial and terrestrial reference systems and frames; applications of new observational techniques; present and future star catalogues and double star astrometry. This comprehensive reference will be invaluable for graduate students and research astronomers.

Astrometry. --- Astrométrie. --- Positional astronomy --- Spherical astronomy --- Astrometry --- Astrométrie

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GEODESICS --- OBSERVATION --- TRIANGULATION --- GEODETIC COORDINATES --- ARTIFICIAL SATELLITES --- THEORIES --- CELESTIAL MECHANICS --- PERTURBATION --- TWO BODY PROBLEM --- PERTURBATION THEORY --- MOTION --- ORBITS --- GEODETIC ASTRONOMY

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52 <063> --- Astrometry --- -Celestial mechanics --- -General relativity (Physics) --- -Gravitational astronomy --- Mechanics, Celestial --- Astrophysics --- Mechanics --- Positional astronomy --- Spherical astronomy --- Astronomie. Astrofysica. Ruimteonderzoek. Geodesie--Congressen --- Congresses --- Celestial mechanics --- General relativity (Physics) --- Congresses. --- -Astronomie. Astrofysica. Ruimteonderzoek. Geodesie--Congressen --- Celestial mechanics.

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Un tour d’horizon de l’astrophysique contemporaine. Une synthèse fondamentale, sans précédent, ouverte à tous. Les plus récentes découvertes présentées par les meilleurs spécialistes. Le Soleil et l’ensemble du système planétaire. Les étoiles et le milieu interstellaire. Les galaxies et les grandes structures de l’Univers. La cosmologie... Où en est l’astronomie, aujourd’hui ? Quelles révolutions a-t-elle traversées ? Qu’en est-il de la Terre ? De la vie, ailleurs, dans l’Univers ? De la recherche d’exoplanètes ? Des moyens les plus récents et les moins conventionnels d’observer le ciel ? Qu’en sera-t-il, demain, des savants, de leurs laboratoires, de leurs instruments, de leurs méthodes, de leurs découvertes ? Voici, enfin, un panorama complet et inédit sur la façon dont les astrophysiciens voient et comprennent ce Monde qui est le nôtre.

Astrophysics. --- Astronomical physics --- Astronomy --- Cosmic physics --- Physics