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Fundamental ephemeris computations / P.J. Heafner (1999)

Public Titre : Fundamental ephemeris computations Type de document : Monographie Auteurs : P.J. Heafner, Auteur Editeur : Richemont (Virginie) : Willmann-Bell Année de publication : 1999 Importance : 320 p. Format : 16 x 24 cm + disquette ISBN/ISSN/EAN : 978-0-943396-63-7 Note générale : Bibliographie Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Astronomie fondamentale [Termes IGN] bibliothèque logicielle [Termes IGN] éphémérides astronomiques Index. décimale : 31.10 Astronomie fondamentale Résumé : (Editeur) Within the last decade there have been several books dealing with the application of personal computers to general problems in celestial mechanics. So, the reader may ask, "Why one more?" The most evident reason is the use of approximations. Usually a full verbal explanation of a procedure is given, but when the algorithm is programmed, approximations are often made that, in the final analysis, defeat the power of a computer. Modem microcomputers are wonderful machines, never bring of performing the same computations over and over again until the user is satisfied with the result. While it is true that efficient coding often reduces the execution time, the point is that there is no need to make any great approximations until the very end of the computation. For instance, R is generally accepted that it is useless to compute times of sunrise and sunset to an accuracy greater than one minute of time because of the uncertain nature of atmospheric refraction near the horizon and the constantly changing local meteorological conditions. However, why not let the computer perform the computation to the full precision of the machine and then let the user round the result to the nearest minute of time? Another major problem with existing computer-oriented astronomical books is that there has been little or no effort to adopt the computational algorithms used for the preparation of data in the national almanacs, particularly the U.S. Naval Observatory's Astronomical Almanac. So the primary goal of this book is to present a library of useful PowerBASIC and C subprograms and functions that can be combined to make powerful application programs. These routines cover both elementary and advanced topics in computational celestial mechanics and spherical astronomy such as time systems, precession, nutation, coordinate transformations, orbital elements and ephemerides, reduction to apparent place, rise/transit/set times for celestial objects, and use of the JPL ephemerides. Care has been taken to present the results of computations in the same form as the corresponding data in the Astronomical Almanac and at least to the same precision. This book is the only one describing how to obtain, process, and use the official Jet Propulsion Laboratory ephemeris data files. The JPL ephemerides form the basis of practically all of the national astronomical almanacs, including the Astronomical Almanac. Many readers will be surprised to learn that these data files are available tree from JPL via the Internet or via a CDROM prepared by JPL and published by WillmannBell. In this book the author gives explicit instructions on how to retrieve them from JPL and put them into a usable form. In addition, with this book a disk that includes enhanced PowerBASIC and C versions of the original JPL FORTRAN processing software that manipulates the data files. Today, these ephemerides are considered to be the final word on planetary ephemerides, and now the serious non-professional who wants to make use of them can do so. Numéro de notice : 69188 Affiliation des auteurs : non IGN Thématique : POSITIONNEMENT Nature : Monographie Accessibilité hors numérique : Non accessible via le SUDOC Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=62128

JPL Planetary and Lunar ephemerides / E.M. Standish (1997)

Public Titre : JPL Planetary and Lunar ephemerides Type de document : Dictionnaire / Usuel Auteurs : E.M. Standish, Auteur ; X.X. Newhall, Auteur ; Jpl, Distributeur ; J.G. Williams, Auteur ; Jet propulsion laboratory, Producteur ; W.M. Folkner, Auteur Editeur : Richemont (Virginie) : Willmann-Bell Année de publication : 1997 Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Astronomie [Termes IGN] éphémérides astronomiques Index. décimale : MULTIM Cédéroms et DVD rangés en armoire grise près de l'accueil Numéro de notice : 39186 Affiliation des auteurs : non IGN Thématique : POSITIONNEMENT Nature : Usuel Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=64161

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Fundamentals of celestial mechanics / J.M.A. Danby (1988)

Public Titre : Fundamentals of celestial mechanics Type de document : Monographie Auteurs : J.M.A. Danby, Auteur Mention d'édition : 2EME EDITION Editeur : Richemont (Virginie) : Willmann-Bell Année de publication : 1988 Importance : 483 p. Format : 16 x 24 cm ISBN/ISSN/EAN : 978-0-943396-20-0 Note générale : Bibliographie Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Astronomie fondamentale [Termes IGN] mécanique céleste [Termes IGN] méthode des moindres carrés [Termes IGN] orbite képlerienne Index. décimale : 31.10 Astronomie fondamentale Résumé : (Editeur) This is an introductory text that should be accessible to reader having a background in calculus and elementary differential equations The original edition 1962 has been radically revised, and emphasis is placed on computation. The numerical analysis needed for the computations is derived, and sample programs (run on a PC) are included. There are introductory chapters on the astronomical background and on vectorial mechanics. Sections dealling with the problem of two bodies include the use of universal variables, several methods (including that of Laguerre) for solving Kepler's equation, and problems. The chapter on the determination of orbits includes two versions of Gauss'method, the application of least squares and an introduction to recursive methods. The chapter on numerical methods includes three methods for the numerical integration of differential equations, one of which has full stepsize control. There are also chapters on perturbations, the three and nbody problems, the motion of the Moon and the rotations of the Earth and Moon. The appendix includes numerical tables and derivations of properties of conic sections that are used in the text. The text includes several hundred problems, and suggested computer projectsa diskette that can be used in conjunction with this text is separately available as detailed on the last page of this book. Numéro de notice : 69187 Affiliation des auteurs : non IGN Thématique : POSITIONNEMENT Nature : Monographie Accessibilité hors numérique : Accessible via le SUDOC (sur demande au cdos) Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=62127