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Softcover. Zustand: sehr gut. Originalbroschur., geklammert, 4°, A 13;B 9;C 28;D 54; E 8;Seiten, gestempelt: ausgeschieden, sonst sehr gutes Exemplar. UNITED STATES NAVAL OBSERVATORY CIRCULAR N O. 155 in englischer Sprache (in english).

Hardcover. Zustand: Good. With dust jacket Ship within 24hrs. Satisfaction 100% guaranteed. APO/FPO addresses supported.

Gr.-8°, original hardcover. 1. ed. With numerous images, XVII, 380 p. Rare copy. Shelfmark on spine, stamp on preliminary page, otherwise very fine copy. Sprache: Englisch Gewicht in Gramm: 0.

Couverture rigide. Zustand: bon. R260269816: 1995. In-8. Relié. Très bon état, Couv. convenable, Dos satisfaisant, Intérieur frais. 441 pages augmentées de quelques figures en noir et blanc dans texte. Avec Jaquette. . . Classification Dewey : 420-Langue anglaise. Anglo-saxon.

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Softcover. 3. ed. 676 S. Ehem. Bibliotheksexemplar mit Signatur und Stempel. GUTER Zustand, ein paar Gebrauchsspuren. Ex-library with stamp and library-signature. GOOD condition, some traces of use. K01147 9781891389856 Sprache: Englisch Gewicht in Gramm: 1375.

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Zustand: New. pp. 168 52:B&W 6.14 x 9.21in or 234 x 156mm (Royal 8vo) Case Laminate on White w/Gloss Lam.

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Taschenbuch. Zustand: Neu. Neuware -'Fundamental Astronomy and Solar System Dynamics', a program of invited papers honoring Professor Walter Fricke, who for thirty years has been Director of the Astronomisches Rechen lnstitut in Heidelberg, was held at the Thompson Conference Center of the University of Texas at Austin on Wednesday 27 March 1985 on the occasion of his seventieth birthday and retirement as Director of ARl. Professor Fricke's contributions to astronomy encompass the areas of galactic dynamics, radial velocities, stellar statistics. the fundamental reference system and the constant of precession. Participants were welcomed to the Uni versi ty of Texas by Professor J. Parker Lamb, Chairman of the Department of Aerospace Engineering and Engineering Mechanics. The presentations ranged from discussions of astrometric problems concerned with the reference system, the constant of precession, major and minor planet observations, planetary ephemerides and lunar and satellite laser ranging, to a study of disc galaxies in massive halos. The program concluded with a review of Professor Fricke's career. The three sessions were chaired by Victor G. Szebehely, Carol A. Williams and Jay H. Lieske. The participants in this meeting, and in the Division on Dynamical Astronomy meeting that followed, were happy that Professor Fricke was able to attend. His presence at these meetings, as well as his thoughtful comments, were greatly appreciated. We are pleased to acknowledge the support of the Center for Space Research, the Department of Astronomy and the Department of Aerospace Engineering and Engineering Mechanics of the University of Texas at Austin.Springer Verlag GmbH, Tiergartenstr. 17, 69121 Heidelberg 164 pp. Englisch.

Taschenbuch. Zustand: Neu. Druck auf Anfrage Neuware - Printed after ordering - decision and investigative process of the scientist, they can also wri te the paragra}ils of scientific resul ts. Once a canputer research activity progresses from intuitive guesses to a systematic study, the canputer program can free the scientist to pursue new original ideas. '!his concept is illustrated in the ptper by Hut. Sussnan says 'Knowledge' is knowing what not to canpute. His main message is that we must change from trying to maximize the efficiency of the canputer to maximizing the effectiveness of the scientist. The canputer is relatively cheap, it is the trained scientist who is most valuable. In the second keynote address, R. L. Duncombe (University of Texas) described the 'Early Applications of Canputer Technology to Dynamical Astronany. ' His talk traced the worldwide introduction of punched card equipnent and their applications through the use of the first electronic canputers. Sussman and Duncombe, therefore, provided a forecast and review of the use of computers in dynamical astronany. This proceedings is intended to provide a consolidated general view of the ptst, present, and future of the Applications of Canputer Technology to Dynamical Astronany. Of necessity this requires that the ptpers be rela ti vely short and provide references to the more canplete discussions. Thanks to the representa tion from so many different countries the proceedings give a picture of the activities worldwide. The Scientific Organizing Comnittee included K. B. IIlatnagar, V. A. Brtmberg, G. Contopoulos, A. Depri t , J. Henrard, J. Kovalevsky, Y.

Taschenbuch. Zustand: Neu. Druck auf Anfrage Neuware - Printed after ordering - Astrometry is on the threshold of great changes due to the fact that this decade, alone, is witnessing an improvement of stellar positions equivalent to the total improvement of the previous two centuries. The Hipparcos Satellite has concluded its observations, and the catalog is in preparation. Preliminary results assure that the Hipparcos catalog will provide positions, parallaxes and annual proper motions for over 100,000 stars with accuracies of 1.5 milliarcseconds. In addition, the Tycho catalog will provide positions of about 30 milliarcseconds accuracy for over 1 million stars, and annual proper motions with 3 milliarcsecond accuracy will subsequently be ob tained by means of first epoch positions from the Astrographic Catalog. Optical interferometers on the ground are beginning operation, and these instruments can provide observational accuracies of approximately one milliarcsecond. Also, the traditional reference frame based on the Fun damental Catalog of bright stars is being replaced by the extragalactic ref erence frame, based on radio sources with accuracies of one milliarcsecond. Thus, astrometry will change from a fundamental reference frame defined in terms of the dynamical reference frame of the solar system with accuracies of 100 milliarcseconds to a space-fixed, extragalactic reference frame with accuracies of one milliarcsecond. Future astrometric observations should be in the 1 -100 milliarcsecond accuracy range. There are a number of concepts for future astrometric instruments in space. Most of these can provide sub-milliarcsecond astrometric accuracies.

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Zustand: New. pp. 476 Illus.

Gebunden. Zustand: New.

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Zustand: New. pp. x + 341 Illus.

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Taschenbuch. Zustand: Neu. Druck auf Anfrage Neuware - Printed after ordering - The uses of time in astronomy - from pointing telescopes, coordinating and processing observations, predicting ephemerides, cultures, religious practices, history, businesses, determining Earth orientation, analyzing time-series data and in many other ways - represent a broad sample of how time is used throughout human society and in space. Time and its reciprocal, frequency, is the most accurately measurable quantity and often an important path to the frontiers of science. But the future of timekeeping is changing with the development of optical frequency standards and the resulting challenges of distributing time at ever higher precision, with the possibility of timescales based on pulsars, and with the inclusion of higher-order relativistic effects. The definition of the second will likely be changed before the end of this decade, and its realization will increase in accuracy; the definition of the day is no longer obvious. The variability of the Earth's rotation presents challengesof understanding and prediction.In this symposium speakers took a closer look at time in astronomy, other sciences,cultures, and business as a defining element of modern civilization. The symposiumaimed to set the stage for future timekeeping standards, infrastructure, and engineeringbest practices for astronomers and the broader society. At the same time the programwas cognizant of the rich history from Harrison's chronometer to today's atomicclocks and pulsar observations. The theoreticians and engineers of time were broughttogether with the educators and historians of science, enriching the understanding oftime among both experts and the public.

Hardcover. Zustand: Very Good+. Zustand des Schutzumschlags: Very Good. 1st Edition. 752 pages. A revision to the Explanatory Supplement to the Astronomical Ephemeris and The American Ephemeris and Nautical Almanac. Illustrated with black and white figures. Pages and endpapers clean, v/g condition. Green cloth, gilt titles. Green dust jacket has few small chips. DJ worn at edges. VG+/VG. Book.