Titlebook: Astrometry of Fundamental Catalogues; The Evolution from O Hans G. Walter,Ojars J. Sovers Book 2000 Springer-Verlag Berlin Heidelberg 2000

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Andreas Bihrer,Stephan Bruhn,Fiona Fritzf stars. The right ascensions of stars in such an instrumental or individual catalogue of absolute observations are obtained by comparing the transits of stars across the local meridian with those of objects of the solar system, predominantly the Sun, whose ephemerides are a realization of the celes

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https://doi.org/10.1007/978-3-658-21738-9e and latitude service stay in the background, as is the case for geodesy and navigation, since radio interferometric and satellite laser techniques provide results far superior to the classical optical methods. A turning point in favour of optical methods may have been reached by the extension of t

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The International Celestial Reference Frame: ICRF,om its predecessors is the breadth of the data base, the care taken to ensure that only sources of the highest quality were selected as the primary defining objects, and considerable agonization to ensure that the best models were used in the data analysis during a period when substantial improvemen