![]() With the extension of observations to almost all wavelengths from radio waves to gamma rays, with the use of very sensitive new receivers and the development of fast computers, remarkable progress has been made in the description and the understanding of the Universe. Since then astrophysics has become the most impor tant domain of astronomy. 59 Seeber G., 2003, Satellite Geodesy (Walter de Gruyter, Berlin NewYork, 2003). ![]() A space mission with Gaia-like astrometric performance is required, but not necessarily a Gaia-like satellite. This mission is described in detail as well as its contributions to astrophysics and space. Astronomy, Astrophysics and Cosmology, (arXiv 1001.0316). Astrometry for Astrophysics Methods, Models, and Applications The field of astrometry, the precise measurement of the positions, distances, and motions of astronomical objects, has been revolutionized in recent years. With Gaia in orbit since December 2013 it is time to look at the future of fundamental astrometry and a time frame of 50 years is needed in this matter. ![]() Until the end of the 19th century, before the development of physical as tronomy, all astronomical observations were directed towards obtaining posi tions of celestial bodies. They also were able to release a component of the spacecraft, the Lunar Module (LM), carrying its own rocket power, to land two astronauts on the Moon and bring. Launch of the FAME spacecraft is scheduled for October 2004. The first, vigorous years when the pioneers worked alone or in small groups are over. The goal of the present book is, in contrast, to provide an up-to-date description of astrometric techniques, particularly the most recent and powerful ones, whether the instruments are on the ground or in space. Radio astronomy is now in such a situation. Although several books describe the theoretical foundations of positional astronomy, they touch only slightly on the descrip tion of instruments and the procedures for obtaining actual geometrical or kinematic quantities, which are among the basic observational data in the study of the Universe and of its components. Astrometry is the domain of astronomy devoted to the determination of po sitions and their time-variations, and by extension, the apparent dimensions and shapes of celestial bodies. Part of the book series: Astronomy and Astrophysics Library (AAL) 1383 Accesses.
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