The evolution of adopted values for precession

Astronomy and Astrophysics – Astronomy

Scientific paper

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Astrometry, Celestial Reference Systems, Precession, Axes Of Rotation, Longitude, Rates (Per Time)

Scientific paper

The history of astronomical longitude precession determination is reviewed. Consideration is given to the work of Hipparchus and Ptolemy, the definition of rotation axes, the major 19th-century determinations, and 20th-century studies (using the data of Newcomb; based on PGC, GC, and McCormick/Cape catalogs; using FK3, FK4, and AGK3; involving galaxies; and using the dynamical method). Laser ranging and VLBI are seen as the most promising techniques for future precession measurements. Diagrams, graphs, and tables of numerical data are provided.

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