GMT
E3380
GMT (Greenwich Mean Time) is the mean solar time at the Royal Observatory in Greenwich, London, historically used as the international civil time standard and the basis for modern time zones.
All labels observed (5)
| Label | Occurrences |
|---|---|
| GMT canonical | 1,716 |
| UTC | 6 |
| Universal Time | 2 |
| Greenwich Mean Time zone | 1 |
| Greenwich time | 1 |
How this entity was disambiguated
This entity first appeared as the object of triple T39452 — resolving that mention is where its identity was fixed. The disambiguator weighed these candidate entities and picked the highlighted one (or “None”, minting a new entity). This is how homonymy is resolved: the same surface form can point to different entities.
NED1
Entity disambiguation (via context triple)
gpt-5-mini-2025-08-07
Target entity: GMT Context triple: [Woodstock, Oxfordshire, timeZone, GMT]
-
A.
Central European Time
Central European Time is a standard time zone used by many countries in central and western Europe, typically one hour ahead of Coordinated Universal Time (UTC+1).
-
B.
Chile Standard Time
Chile Standard Time is the primary time zone used in central Chile, including regions such as Coquimbo, typically set at UTC−4 hours.
-
C.
Eastern Time Zone
The Eastern Time Zone is a standard time zone used by the eastern portion of North America, including major U.S. cities such as New York and Washington, D.C.
-
D.
North American time zones
North American time zones are the standardized regional time divisions used across countries in North America, including zones such as Eastern, Central, Mountain, and Pacific Time.
-
E.
Japan Standard Time
Japan Standard Time is the standard time zone used throughout Japan, set at nine hours ahead of Coordinated Universal Time (UTC+9) without daylight saving time.
- F. None of above. chosen
- G. Unsure - the case is ambiguous/there is not enough information to decide.
NED2
Entity disambiguation (via description)
gpt-5-mini-2025-08-07
Target entity: GMT Target entity description: GMT (Greenwich Mean Time) is the mean solar time at the Royal Observatory in Greenwich, London, historically used as the international civil time standard and the basis for modern time zones.
-
A.
Central European Time
Central European Time is a standard time zone used by many countries in central and western Europe, typically one hour ahead of Coordinated Universal Time (UTC+1).
-
B.
Chile Standard Time
Chile Standard Time is the primary time zone used in central Chile, including regions such as Coquimbo, typically set at UTC−4 hours.
-
C.
Eastern Time Zone
The Eastern Time Zone is a standard time zone used by the eastern portion of North America, including major U.S. cities such as New York and Washington, D.C.
-
D.
North American time zones
North American time zones are the standardized regional time divisions used across countries in North America, including zones such as Eastern, Central, Mountain, and Pacific Time.
-
E.
Japan Standard Time
Japan Standard Time is the standard time zone used throughout Japan, set at nine hours ahead of Coordinated Universal Time (UTC+9) without daylight saving time.
- F. None of above. chosen
Statements (42)
| Predicate | Object |
|---|---|
| instanceOf |
time scale
ⓘ
time standard ⓘ |
| abbreviationOf | Greenwich Mean Time ⓘ |
| basedOn | mean solar time ⓘ |
| category |
time in the United Kingdom
ⓘ
time zones ⓘ |
| definedBy | mean solar time at Greenwich meridian ⓘ |
| fullName | Greenwich Mean Time ⓘ |
| governingBody |
Royal Observatory, Greenwich
ⓘ
linked to:
Maritime Greenwich
|
| hasNoDaylightSavingOffset | true ⓘ |
| historicallyReplacedBy | Coordinated Universal Time ⓘ |
| introducedInCentury | 19th century ⓘ |
| locatedIn |
Greenwich
ⓘ
London ⓘ
linked to:
London, England
United Kingdom ⓘ |
| measuredAt |
Royal Observatory, Greenwich
ⓘ
linked to:
Maritime Greenwich
|
| observedAsStandardTimeIn |
Burkina Faso
ⓘ
Côte d'Ivoire ⓘ Equatorial Guinea (Bioko Island) ⓘ
linked to:
Bioko Island
Ghana ⓘ Guinea ⓘ Guinea-Bissau ⓘ Iceland ⓘ Ireland (winter) ⓘ
linked to:
Ireland
Liberia ⓘ Mali ⓘ Portugal (mainland, winter) ⓘ Senegal ⓘ Sierra Leone ⓘ The Gambia ⓘ Togo ⓘ United Kingdom (winter) ⓘ |
| referenceLongitude | 0 degrees longitude ⓘ |
| referenceMeridian | Prime Meridian ⓘ |
| relatedTo |
UTC
ⓘ
linked to:
Coordinated Universal Time
|
| supersededInPrecisionBy | atomic time ⓘ |
| timeOffsetFromUTC | UTC+00:00 ⓘ |
| usedAs |
basis for modern time zones
ⓘ
international civil time standard ⓘ |
| usedFor |
international timekeeping
ⓘ
navigation ⓘ railway timetables ⓘ |
How these facts were elicited
The pipeline generated the facts above by prompting gpt-5.1 with this entity's name + description and the instruction below.
Instruction
You are a knowledge base construction expert. Given a subject entity and a description of it, return factual statements that you know for the subject as a JSON list of dictionaries(triples), where keys must be "subject", "predicate" and "object". The number of facts may be very high, between 25 to 50 or more, for very popular subjects. For less popular subjects, the number of facts can be very low, like 5 or 10. # Requirements - If you don't know the subject at all, return an empty list. - If the subject is not a named entity, return an empty list. - Include at least one triple where predicate is "instanceOf". - Do not get too wordy. - Separate several objects into multiple triples with one object.
Input
Subject: GMT Description of subject: GMT (Greenwich Mean Time) is the mean solar time at the Royal Observatory in Greenwich, London, historically used as the international civil time standard and the basis for modern time zones.
Referenced by (1,726)
Full triples — surface form annotated when it differs from this entity's canonical label.
subject linked to:
Woodstock, Oxfordshire, England
linked to: GMT
subject linked to:
Great Yarmouth, Norfolk, England
subject linked to:
Grayshott, Hampshire, England
linked to: GMT
subject linked to:
Cullercoats, England, United Kingdom
subject linked to:
Norfolk, England
subject linked to:
Sidcup (part)