Greenwich Mean Time
E3109
Greenwich Mean Time is the mean solar time at the Royal Observatory in Greenwich, London, historically used as the world’s primary reference for timekeeping and the basis for Coordinated Universal Time (UTC).
All labels observed (6)
| Label | Occurrences |
|---|---|
| Greenwich Mean Time canonical | 1,763 |
| Greenwich Mean Time (when GMT is UTC+0) | 1 |
| Greenwich Mean Time (when GMT is used as winter time) | 1 |
| International Meridian Conference of 1884 | 1 |
| Universal Time | 1 |
| Western European Time | 1 |
Statements (47)
| Predicate | Object |
|---|---|
| instanceOf |
civil time standard
ⓘ
time standard ⓘ time zone ⓘ |
| abbreviation | GMT ⓘ |
| associatedWith |
Prime Meridian
ⓘ
longitude 0° ⓘ |
| basisFor |
Coordinated Universal Time
ⓘ
UTC offset system ⓘ |
| category |
astronomy
ⓘ
navigation ⓘ timekeeping ⓘ |
| coordinateReference | 0 hours offset baseline ⓘ |
| coordinateSystemRole | reference for global time zones ⓘ |
| definedAs | mean solar time at the Royal Observatory, Greenwich ⓘ |
| definedRelativeTo | Earth rotation ⓘ |
| governingBody |
Maritime Greenwich
ⓘ
surface form:
Royal Observatory, Greenwich
|
| hasAlternativeName |
GMT
ⓘ
GMT ⓘ
surface form:
Greenwich time
|
| historicalRole |
basis for international civil time
ⓘ
world primary reference for timekeeping ⓘ |
| language | English term ⓘ |
| measurementType | mean solar time ⓘ |
| notSameAs | local apparent solar time at Greenwich ⓘ |
| observesDaylightSaving | false ⓘ |
| offsetRange | +00:00 year-round ⓘ |
| referenceCity |
London, England
ⓘ
surface form:
London
|
| referenceCountry | United Kingdom ⓘ |
| referenceLocation |
Maritime Greenwich
ⓘ
surface form:
Royal Observatory, Greenwich
|
| relatedStandard | International Atomic Time ⓘ |
| relatedTo |
British Summer Time
ⓘ
UT1 ⓘ Greenwich Mean Time self-linksurface differs ⓘ
surface form:
Universal Time
|
| replacedBy | Coordinated Universal Time ⓘ |
| standardizedAt | International Meridian Conference ⓘ |
| standardizedInYear | 1884 ⓘ |
| supersededInPrecisionBy | atomic time ⓘ |
| timeOffsetFromUTC | UTC+00:00 ⓘ |
| usedAs | prime meridian time standard ⓘ |
| usedAsLegalTime | true in some jurisdictions ⓘ |
| usedIn |
Iceland
ⓘ
Ireland (winter) ⓘ Portugal (mainland, winter) ⓘ United Kingdom (winter) ⓘ West Africa ⓘ
surface form:
West Africa (some countries)
some Atlantic islands ⓘ |
| usedInAviation | yes (historically, now largely UTC) ⓘ |
| usedInMaritimeNavigation | yes ⓘ |
Referenced by (1,768)
Full triples — surface form annotated when it differs from this entity's canonical label.
this entity surface form:
International Meridian Conference of 1884
subject surface form:
London
this entity surface form:
Universal Time
subject surface form:
Cambridgeshire
subject surface form:
Prime Minister's Office (United Kingdom)