Terrestrial Time
E116186
Terrestrial Time is a modern astronomical time standard used for precise calculations of planetary motion and ephemerides, defined in relation to atomic time rather than Earth's rotation.
All labels observed (2)
| Label | Occurrences |
|---|---|
| Terrestrial Dynamical Time | 2 |
| Terrestrial Time canonical | 1 |
How this entity was disambiguated
This entity first appeared as the object of triple T982995 — 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: Terrestrial Time Context triple: [International Atomic Time, closelyRelatedTo, Terrestrial 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.
International Atomic Time
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.
-
C.
Zulu time
Zulu time is a standardized time reference used worldwide—especially in aviation, military, and navigation—corresponding to Coordinated Universal Time (UTC) and denoted by the letter "Z."
-
D.
The Time Regulation Institute
The Time Regulation Institute is a satirical novel by Turkish author Ahmet Hamdi Tanpınar that critiques modernization and bureaucracy in early 20th-century Turkey.
-
E.
Einstein synchronization convention
The Einstein synchronization convention is a method in special relativity for synchronizing distant clocks using light signals, forming the standard basis for defining simultaneity in inertial frames.
- 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: Terrestrial Time Target entity description: Terrestrial Time is a modern astronomical time standard used for precise calculations of planetary motion and ephemerides, defined in relation to atomic time rather than Earth's rotation.
-
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.
International Atomic Time
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.
-
C.
Zulu time
Zulu time is a standardized time reference used worldwide—especially in aviation, military, and navigation—corresponding to Coordinated Universal Time (UTC) and denoted by the letter "Z."
-
D.
The Time Regulation Institute
The Time Regulation Institute is a satirical novel by Turkish author Ahmet Hamdi Tanpınar that critiques modernization and bureaucracy in early 20th-century Turkey.
-
E.
Einstein synchronization convention
The Einstein synchronization convention is a method in special relativity for synchronizing distant clocks using light signals, forming the standard basis for defining simultaneity in inertial frames.
- F. None of above. chosen
Statements (47)
| Predicate | Object |
|---|---|
| instanceOf |
astronomical time scale
ⓘ
time standard ⓘ |
| abbreviation | TT ⓘ |
| basedOn | atomic time ⓘ |
| basisOf |
Barycentric Coordinate Time transformations
ⓘ
Barycentric Dynamical Time ⓘ |
| category |
astronomy
ⓘ
celestial mechanics ⓘ timekeeping ⓘ |
| continuity | continuous without leap seconds ⓘ |
| coordinateType | proper time of a clock on the geoid ⓘ |
| definedBy | International Astronomical Union ⓘ |
| definedIn | IAU 1991 Resolution A4 ⓘ |
| distinctFrom |
Greenwich Mean Time
ⓘ
Local civil time ⓘ Universal Time 1 ⓘ Universal Time 2 ⓘ |
| epochOffsetDefinedAt | 1977-01-01T00:00:00 TAI ⓘ |
| epochOffsetValue | TT = TAI + 32.184 s ⓘ |
| follows | International Atomic Time ⓘ |
| frame | geocentric reference frame ⓘ |
| governingTheory | general relativity ⓘ |
| maintainedBy | timekeeping and astronomical institutions ⓘ |
| notBasedOn | Earth rotation ⓘ |
| offsetFromTAI | 32.184 seconds ⓘ |
| precision | suitable for relativistic timekeeping ⓘ |
| primaryUseDomain | solar system ephemeris construction ⓘ |
| referenceLocation |
Earth geocenter
ⓘ
geoid ⓘ |
| refinedIn |
IAU 2000 resolutions
ⓘ
IAU 2006 resolutions ⓘ |
| relatedTo |
Coordinated Universal Time
ⓘ
International Atomic Time ⓘ GMT ⓘ
surface form:
Universal Time
|
| replaced |
Terrestrial Time
self-linksurface differs
ⓘ
surface form:
Terrestrial Dynamical Time
|
| scaleType | coordinate time scale ⓘ |
| status | current standard for geocentric astronomical timekeeping ⓘ |
| successorOf |
Ephemeris Time
ⓘ
Terrestrial Time self-linksurface differs ⓘ
surface form:
Terrestrial Dynamical Time
|
| symbol | T_T ⓘ |
| timeUnit | SI second ⓘ |
| usedFor |
ephemerides
ⓘ
high-precision astronomical observations ⓘ lunar motion calculations ⓘ planetary motion calculations ⓘ solar system dynamics ⓘ spacecraft navigation ⓘ |
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: Terrestrial Time Description of subject: Terrestrial Time is a modern astronomical time standard used for precise calculations of planetary motion and ephemerides, defined in relation to atomic time rather than Earth's rotation.
Referenced by (3)
Full triples — surface form annotated when it differs from this entity's canonical label.
this entity surface form:
Terrestrial Dynamical Time
this entity surface form:
Terrestrial Dynamical Time