Modern time scales

Details Modern time scales Modern time scales

Sep 1989

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1989iraj...19...56w&link_type=abstract

(Astronomical Science Group of Ireland, Meeting, Dundalk Regional College, Republic of Ireland, Mar. 23, 1989) Irish Astronomica

Astronomy and Astrophysics

Astronomy

Astronomy, Cosmology, Relativity, Time, Solar System, Stellar Motions

Scientific paper

The history of time and frequency standards is reviewed, focusing on the importance of accurate time-scales for astronomy. The development of accurate clocks, the equation of time relating true solar time to mean solar time, and the establishment of dynamical time-scales derived from motion in the solar system are examined. The incorporation of relativistic effects and the differentiation between coordinate time and proper time are discussed. Also, consideration is given to the organizations responsible for time standards and the definitions of various time-scales, such as the associated time scale, coordinated universal time, barycentric dynamical time, and terrestrial dynamical time.

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