International Atomic Time

E21211

atomic time scale time standard

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.

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All labels observed (4)

Label	Occurrences
International Atomic Time canonical	11
Galileo System Time	1
TAI time scale	1
Temps Atomique International	1

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 ⓘ International Bureau of Weights and Measures ⓘ surface form: Comité International des Poids et Mesures
introduced	late 1950s ⓘ
language	multilingual designation ⓘ
leapSecondsApplied	no ⓘ
maintainedBy	International Bureau of Weights and Measures ⓘ surface form: BIPM International Bureau of Weights and Measures ⓘ surface form: Bureau International des Poids et Mesures
referenceFor	Coordinated Universal Time ⓘ Coordinated Universal Time ⓘ surface form: UTC 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	International Atomic Time self-linksurface differs ⓘ surface form: TAI time scale
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 ⓘ

Referenced by (14)

Full triples — surface form annotated when it differs from this entity's canonical label.

Greenwich Mean Time → relatedStandard → International Atomic Time ⓘ

PTP → timeScale → International Atomic Time ⓘ

Coordinated Universal Time → basedOn → International Atomic Time ⓘ

Coordinated Universal Time → coordinatedWith → International Atomic Time ⓘ

International Atomic Time → shortName → International Atomic Time self-linksurface differs ⓘ

this entity surface form: TAI time scale

Galileo satellite navigation system → timeStandard → International Atomic Time ⓘ

this entity surface form: Galileo System Time

National Standard Time → relatedStandard → International Atomic Time ⓘ

TAI → fullName → International Atomic Time ⓘ

TAI → abbreviationFor → International Atomic Time ⓘ

this entity surface form: Temps Atomique International

SI second → usedIn → International Atomic Time ⓘ

Terrestrial Time → follows → International Atomic Time ⓘ

Terrestrial Time → relatedTo → International Atomic Time ⓘ

TT → relatedTo → International Atomic Time ⓘ

subject surface form: Terrestrial Time

U.S. Naval Observatory Master Clock → contributesTo → International Atomic Time ⓘ