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Definition of Universal time

Babylon English

Greenwich Mean Time
Universal time Definition from Language, Idioms & Slang Dictionaries & Glossaries
hEnglish - advanced version

universal time
n : the local time at the 0 meridian passing through greenwich, england; it is the same everywhere [syn: greenwich mean time , greenwich time, gmt, ut, ut1]



WordNet 2.0

Noun
1. the local time at the 0 meridian passing through Greenwich, England; it is the same everywhere
(synonym) Greenwich Mean Time, Greenwich Time, GMT, UT, UT1
(hypernym) time
(hyponym) coordinated universal time, UTC
Universal time Definition from Government Dictionaries & Glossaries
DOD Dictionary of Military Terms
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.
  
Source: U.S. Department of Defense, Joint Doctrine Division. ( About )
Universal time Definition from Science & Technology Dictionaries & Glossaries
Telecommunication Standard Terms
1. The basis for coordinated dissemination of time signals, counted from 0000 at midnight. 2. In celestial navigation applications, the time which gives the exact rotational orientation of the Earth obtained from UTC by applying increments determined by the U.S. Naval Observatory. 3. 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. Note: 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 (UTC). [JP1] 4. The official civil time of the United Kingdom. Formerly called Greenwich Mean Time. Contrast with Coordinated Universal Time.
Solar Energy
See Coordinated Universal Time .
Solar Physics Glossary
Abbreviated UT. The same as Greenwich Mean Time (GMT) in England. Eastern Standard Time (EST) is five hours earlier than Universal Time.
Universal time Definition from Encyclopedia Dictionaries & Glossaries
English Wikipedia - The Free Encyclopedia
Universal Time (UT) is a time standard based on Earth's rotation. It is a modern continuation of Greenwich Mean Time (GMT), i.e., the mean solar time on the Prime Meridian at Greenwich. In fact, the expression "Universal Time" is ambiguous (when accuracy of better than a few seconds is required), as there are several versions of it, the most commonly used being Coordinated Universal Time (UTC) and UT1 (see below). All of these versions of UT, except for UTC, are based on Earth's rotation relative to distant celestial objects (stars and quasars), but with a scaling factor and other adjustments to make them closer to solar time. UTC is based on International Atomic Time, with leap seconds added to keep it within 0.9 second of UT1.

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Universal time Definition from Religion & Spirituality Dictionaries & Glossaries
Webart Magic Astronomical Glossary
Abbreviated UT. The same as Greenwich Mean Time (GMT) in England. Eastern Standard Time (EST) is five hours earlier than Universal Time.