Astronomy and Astrophysics – Astronomy
Scientific paper
Sep 2005
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2005jsrs.meet..254a&link_type=abstract
In: Journées 2004 - systèmes de référence spatio-temporels. Fundamental astronomy: new concepts and models for high accuracy obs
Astronomy and Astrophysics
Astronomy
5
Coordinated Universal Time
Scientific paper
The system of Coordinated Universal Time, UTC, was initially conceived at the beginning of the 1960's as a means of improving the dissemination of Universal Time, UT1, and to make available the stable frequency of atomic standards in a single time signal emission. It gradually evolved by relaxing the tolerance on UT1 and in 1971 reached the form we know to-day. In spite of its success, borne out by 33 years of existence, the present system suffers increasingly from the inconvenience of leap seconds. The number of users in need of a continuous time scale is increasing, and as a consequence there is a proliferation of scales built for specific purposes due to the fact that UTC is not satisfactory for their applications. Global Navigation Satellite Systems time scales are examples of this situation. These notes bring together some astronomical elements that should be kept in mind in any proposed revision of the UTC system and give our views on a new system of time dissemination.
Felicitas Arias Elisa
Guinot Benjamin
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