universal time
n. Greenwich Mean Time | ||||
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Universal Time definition was found in categories: Computer & Internet(1) Government(1) Language, Idioms & Slang(2) Science & Technology(4) Religion & Spirituality(1) Encyclopedia(1)
Universal Time Definition from Computer & Internet Dictionaries & Glossaries
| FOLDOC |
Universal Time
<time, standard> (UT) The mean solar time along the prime meridian (0 longitude) that runs through the Greenwich Observatory outside of London, UK, where the current system originated. UT is tied to the rotation of the Earth in respect to the fictitious "mean Sun".
Greenwich Mean Time (GMT) was measured from Greenwich mean midday until 1925 when the reference point was changed from noon to midnight and the name changed to "Universal Time".
There are three separate definitions, UT0, UT1, and UT2, depending on which corrections have been applied to the Earth's motion. Coordinated Universal Time is kept within 0.9 seconds of UT1, by addition of leap seconds to International Atomic Time.
(2001-08-02)
<time, standard> (UT) The mean solar time along the prime meridian (0 longitude) that runs through the Greenwich Observatory outside of London, UK, where the current system originated. UT is tied to the rotation of the Earth in respect to the fictitious "mean Sun".
Greenwich Mean Time (GMT) was measured from Greenwich mean midday until 1925 when the reference point was changed from noon to midnight and the name changed to "Universal Time".
There are three separate definitions, UT0, UT1, and UT2, depending on which corrections have been applied to the Earth's motion. Coordinated Universal Time is kept within 0.9 seconds of UT1, by addition of leap seconds to International Atomic Time.
(2001-08-02)
Universal Time Definition from Government Dictionaries & Glossaries
| DOD Dictionary of Military Terms |
Universal Time
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.
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.
Universal Time Definition from Language, Idioms & Slang Dictionaries & Glossaries
| WordNet 2.0 |
universal time
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
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
| hEnglish - advanced version |
universal time
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]
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]
Universal Time Definition from Science & Technology Dictionaries & Glossaries
| Telecommunication Standard Terms |
Universal Time (UT)
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.
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.
| Physical Geography Terms and Meanings |
Universal Time (UT)
The mean solar time of the meridian at the Prime Meridian. Universal Time replaced the time standard known as Greenwich Mean Time in 1928. Universal Time is commonly used to denote solar time. Universal Transverse Mercator (UTM) Grid System Rectangular coordinate system used to find location of points on the Earth's surface. Based on the Universal Transverse Mercator projection system.
The mean solar time of the meridian at the Prime Meridian. Universal Time replaced the time standard known as Greenwich Mean Time in 1928. Universal Time is commonly used to denote solar time. Universal Transverse Mercator (UTM) Grid System Rectangular coordinate system used to find location of points on the Earth's surface. Based on the Universal Transverse Mercator projection system.
| Solar Physics Glossary |
Universal Time
Abbreviated UT. The same as Greenwich Mean Time (GMT) in England. Eastern Standard Time (EST) is five hours earlier than Universal Time.
Abbreviated UT. The same as Greenwich Mean Time (GMT) in England. Eastern Standard Time (EST) is five hours earlier than Universal Time.
| Solar Energy |
Universal Time Definition from Religion & Spirituality Dictionaries & Glossaries
| Webart Magic Astronomical Glossary |
Universal Time
Abbreviated UT. The same as Greenwich Mean Time (GMT) in England. Eastern Standard Time (EST) is five hours earlier than Universal Time.
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
| Wikipedia English - The Free Encyclopedia |
Universal Time
Universal Time (UT) is a timescale 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 meridian of Greenwich, England, which is the conventional zero meridian for geographic longitude. GMT is sometimes used as a synonym for UTC. The old GMT has been split, in effect, into UTC and UT1.
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