Time scales - Their history, definition and interpretation

Details Time scales - Their history, definition and interpretation Time scales - Their history, definition and interpretation

Apr 1988

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1988a%26a...194..304g&link_type=abstract

Astronomy and Astrophysics (ISSN 0004-6361), vol. 194, no. 1-2, April 1988, p. 304-308.

Astronomy and Astrophysics

Astrophysics

15

Ephemerides, Ephemeris Time, Time Measurement, Celestial Mechanics, Center Of Gravity

Scientific paper

The International Astronomical Union (IAU) adopted in 1976 a recommendation for time scales for dynamical theories and ephemerides. In 1979 the IAU adopted the names Terrestrial Dynamical Time (TDT) and Barycentric Dynamical Time (TDB) for those time scales. In the time period since those adoptions, questions concerning the interpretation, meaning and implications of these time scales have arisen. There have also been discussions at the 1982 IAU General Assembly and at other IAU Colloquia concerning the relativistic implications of the different time scales. In 1985 the IAU appointed a Working Group for Reference Frames with the added requirement that it consider the relationship between TAI and TDT. This paper is meant to clarify the interpretations and meaning concerning these time scales.

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