Adjacent Words

universal time definitions

	Tweet

WordNet (r) 3.0 (2005)

n
1: the local time at the 0 meridian passing through Greenwich, England; it is the same everywhere [syn: Greenwich Mean Time, Greenwich Time, GMT, universal time, UT, UT1]

Merriam Webster's

noun Date: 1882 Greenwich mean time

Britannica Concise

Mean (solar) time of the Greenwich meridian (0° longitude). Universal Time replaced the designation Greenwich Mean Time in 1928; since 1972 it has been based on international atomic time, a uniform time derived from the frequences of certain atomic transitions and measured by an atomic clock. For most purposes, it is now identical to Greenwich Mean Time.

U.S. Military Dictionary

A measure of time that conforms, within a close approximation, to the mean diurnal rotation of the Earth and serves as the basis of civil timekeeping. Universal Time (UT1) is determined from observations of the stars, radio sources, and also from ranging observations of the moon and artificial Earth satellites. The scale determined directly from such observations is designated Universal Time Observed (UTO); it is slightly dependent on the place of observation. When UTO is corrected for the shift in longitude of the observing station caused by polar motion, the time scale UT1 is obtained. When an accuracy better than one second is not required, Universal Time can be used to mean Coordinated Universal Time. Also called ZULU time. Formerly called Greenwich Mean Time.