By Jean Kovalevsky
An creation to useful astrometry, facing the selection of positions, motions, distances and dimensions of celestial our bodies starting from quasars to man made satellites. For this second version, the discharge of the Hipparcos and Tycho catalogs, the increase in CCD astrometry and the adoption of a brand new celestial reference body through the IAU ended in an important amendment of the textual content. And, particularly, the outlook for astrometry has been thoroughly rewritten.
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