Universal Time (UT)

Details Universal Time (UT) Universal Time (UT)

Nov 2000

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2000eaa..booke5016.&link_type=abstract

"Encyclopedia of Astronomy and Astrophysics, Edited by Paul Murdin, article 5016. Bristol: Institute of Physics Publishing, 2001

Astronomy and Astrophysics

Astrophysics

Coordinates, Time, And Motion, Positional Concepts

Scientific paper

A measurement of time used for civil timekeeping and based on the Sun's daily apparent motion. It is the mean solar time of the Greenwich meridian at 0° longitude. Universal Time replaced Greenwich Mean Time in 1928. In 1955 the International Astronomical Union defined a number of categories of Universal Time with increasing accuracy. UT0, the least accurate, is based on the optical observ...

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