International Atomic Time
E21211
International Atomic Time is a high-precision time standard based on the combined output of atomic clocks worldwide, serving as the fundamental reference for modern civil and scientific timekeeping.
All labels observed (4)
| Label | Occurrences |
|---|---|
| International Atomic Time canonical | 16 |
| Galileo System Time | 1 |
| TAI time scale | 1 |
| Temps Atomique International | 1 |
How this entity was disambiguated
This entity first appeared as the object of triple T170479 — 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: International Atomic Time Context triple: [Greenwich Mean Time, relatedStandard, International Atomic Time]
-
A.
Coordinated Universal Time
Coordinated Universal Time (UTC) is the primary global time standard by which the world regulates clocks and time, serving as the basis for most civil time zones.
-
B.
Greenwich Mean Time
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).
-
C.
Moscow Time
Moscow Time is the standard time zone used in Moscow and much of western Russia, corresponding to UTC+3 year-round.
-
D.
Easter Island Standard Time
Easter Island Standard Time is the time zone used on Chile’s Easter Island, typically four hours behind Coordinated Universal Time (UTC−6) outside of daylight saving periods.
-
E.
IEEE 1588 Precision Time Protocol standard
The IEEE 1588 Precision Time Protocol standard defines a method for highly accurate time synchronization over packet-based networks, widely used in industrial automation, telecommunications, and power systems.
- 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: International Atomic Time Target entity description: International Atomic Time is a high-precision time standard based on the combined output of atomic clocks worldwide, serving as the fundamental reference for modern civil and scientific timekeeping.
-
A.
Coordinated Universal Time
Coordinated Universal Time (UTC) is the primary global time standard by which the world regulates clocks and time, serving as the basis for most civil time zones.
-
B.
Greenwich Mean Time
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).
-
C.
Moscow Time
Moscow Time is the standard time zone used in Moscow and much of western Russia, corresponding to UTC+3 year-round.
-
D.
Easter Island Standard Time
Easter Island Standard Time is the time zone used on Chile’s Easter Island, typically four hours behind Coordinated Universal Time (UTC−6) outside of daylight saving periods.
-
E.
IEEE 1588 Precision Time Protocol standard
The IEEE 1588 Precision Time Protocol standard defines a method for highly accurate time synchronization over packet-based networks, widely used in industrial automation, telecommunications, and power systems.
- F. None of above. chosen
Statements (46)
| Predicate | Object |
|---|---|
| instanceOf |
atomic time scale
ⓘ
time standard ⓘ |
| abbreviation | TAI ⓘ |
| accuracy | on the order of 10^-16 with primary standards ⓘ |
| basedOn |
atomic clocks
ⓘ
cesium atomic clocks ⓘ |
| category |
metrology
ⓘ
timekeeping ⓘ |
| closelyRelatedTo |
TT
ⓘ
Terrestrial Time ⓘ |
| continuousWithNoJumps | true ⓘ |
| coordinatedBy | International Bureau of Weights and Measures ⓘ |
| definedBy |
International System of Units
ⓘ
SI second ⓘ |
| epoch | 1958-01-01T00:00:00 ⓘ |
| epochReference | geocenter ⓘ |
| formalAdoption | 1960s ⓘ |
| frameOfReference | Earth geoid ⓘ |
| governingOrganization |
CIPM
ⓘ
Comité International des Poids et Mesures ⓘ
linked to:
International Bureau of Weights and Measures
|
| introduced | late 1950s ⓘ |
| language | multilingual designation ⓘ |
| leapSecondsApplied | no ⓘ |
| maintainedBy |
BIPM
ⓘ
linked to:
International Bureau of Weights and Measures
Bureau International des Poids et Mesures ⓘ
linked to:
International Bureau of Weights and Measures
|
| referenceFor |
Coordinated Universal Time
ⓘ
UTC ⓘ
linked to:
Coordinated Universal Time
modern civil timekeeping ⓘ scientific timekeeping ⓘ |
| relationToUTC | UTC = TAI plus or minus leap seconds ⓘ |
| scaleUnit | second ⓘ |
| secondDefinition | 9,192,631,770 periods of the radiation corresponding to the transition between the two hyperfine levels of the ground state of the cesium-133 atom ⓘ |
| shortName |
TAI time scale
ⓘ
linked to:
International Atomic Time
|
| stability | high frequency stability ⓘ |
| successorOf | ephemeris time ⓘ |
| timeScaleType |
continuous time scale
ⓘ
uniform time scale ⓘ |
| usedFor |
astronomy
ⓘ
fundamental physics experiments ⓘ geodesy ⓘ satellite navigation ⓘ spacecraft tracking ⓘ |
| usesDataFrom |
national metrology institutes
ⓘ
over 400 atomic clocks worldwide ⓘ primary frequency standards ⓘ secondary frequency standards ⓘ |
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: International Atomic Time Description of subject: International Atomic Time is a high-precision time standard based on the combined output of atomic clocks worldwide, serving as the fundamental reference for modern civil and scientific timekeeping.
Referenced by (19)
Full triples — surface form annotated when it differs from this entity's canonical label.
linked to: International Atomic Time
linked to: International Atomic Time
linked to: International Atomic Time
subject linked to:
SYRTE (Time-Space Reference Systems)