Universal Time (UT) is a time standard based on the rotation of the Earth. It is a modern continuation of Greenwich Mean Time (GMT), i.e., the mean solar time on the Prime Meridian at Greenwich, and GMT is sometimes used loosely as a synonym for UTC. In fact, the expression `Universal Time` is ambiguous (when accuracy of better than a few second.....
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Also recognized as Greenwich Mean Time, forming the basis in all civil time keeping. Local time centered in Greenwich, England.
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http://planetfacts.org/space-terms/
The mean solar time of the meridian of Greenwich, England. Formerly called Greenwich mean time.
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http://www.braeunig.us/space/glossary.htm
the mean solar time of the Greenwich meridian (0° longitude). Universal Time replaced the designation Greenwich Mean Time in 1928; it is now used to ... [4 related articles]
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http://www.britannica.com/eb/a-z/u/13
(UT) A worldwide standard that serves as the basis of civil and most astronomical timekeeping, also known as Greenwich Mean Time (GMT). UT is defined as the hour angle of the mean sun as seen by an observer on the prime meridian plus 12 hours (so that 0000 UT corresponds to midn...
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one of the time scales based on the rotation of the Earth NOTE 1 - In applications in which an imprecision of a few hundredths of a second cannot be tolerated, it is necessary to specify the forms of universal time which should be used: - UT0 is the mean solar time of the prime meridian obtained from direct astronomical observation; - UT1 is UT0 co...
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The local mean time of the prime meridian. It is the same as Greenwich mean time, counted from 0 hour beginning at Greenwich mean midnight.
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(UT) Also known as Greenwich Mean Time, this is local time on the Greenwich meridian. Universal time is used by astronomers as a standard measure of time.
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Greenwich Mean Time, expressed in the 24-hour system. For example, 23:00 UT is 7:00 p.m. Eastern Daylight Time (or 6:00 p.m. Eastern Standard Time). Astronomers use Universal Time to describe when celestial events happen in a way that is independent of an observers time zone.
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http://www.skyandtelescope.com/astronomy-terms/
Abbreviated UT. The same as Greenwich Mean Time (GMT) in England. Eastern Standard Time (EST) is five hours earlier than Universal Time.
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(often caps.) SeeUT
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