Astronomy and Astrophysics – Astronomy
Scientific paper
Jun 1992
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1992esasp.340...51g&link_type=abstract
In ESA, Frequency and Time Forum p 51-56 (SEE N93-24978 09-70)
Astronomy and Astrophysics
Astronomy
Celestial Mechanics, Celestial Reference Systems, Coordinates, Recommendations, Relativity, Time, Time Measurement, Astronomy, Atomic Clocks, Earth Rotation, Metrology, Orbits, Pulsars, Relativistic Effects
Scientific paper
A series of recommendations on space-time references issued in the framework of the general theory of relativity in 1991 by the International Astronomical Unions (IAU) is presented. The recommendations, their background, the difficulties that were met, and the connection with previous recommendations--with an emphasis on time--are given. For simplicity of theoretical developments in celestial mechanics, several coordinate systems must be defined. The implied definitions of new coordinate times are presented together with their relation between themselves and to other times. International Atomic Time (TAI) is not affected by these recommendations, but appears now as a realization of the ideal terrestrial time having a clear scientific definition.
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