Universal Time 1
E497213
Universal Time 1 (UT1) is an astronomical time standard based on Earth's actual rotation, closely tracking mean solar time at the prime meridian and used in precise navigation and astronomy.
Observed surface forms (1)
| Surface form | Occurrences |
|---|---|
| Universal Time | 1 |
Statements (46)
| Predicate | Object |
|---|---|
| instanceOf |
astronomical time scale
ⓘ
time standard ⓘ |
| abbreviation |
IERS
NERFINISHED
ⓘ
UT1 ⓘ |
| abbreviationStyle | UT1 ⓘ |
| appliesTo | Earth NERFINISHED ⓘ |
| basedOn | Earth's rotation ⓘ |
| category |
celestial mechanics
ⓘ
timekeeping ⓘ |
| closelyRelatedTo | mean solar time ⓘ |
| comparedWith | Coordinated Universal Time NERFINISHED ⓘ |
| coordinateRole | Earth orientation parameter ⓘ |
| definedIn | IERS Conventions NERFINISHED ⓘ |
| definedRelativeTo | Earth rotation angle ⓘ |
| dependsOn | variations in Earth's rotation ⓘ |
| differsFrom |
UT0
ⓘ
UT2 ⓘ |
| epochReference | Greenwich midnight ⓘ |
| fullName | Universal Time 1 NERFINISHED ⓘ |
| governedBy | International Earth Rotation and Reference Systems Service NERFINISHED ⓘ |
| hasProperty | continuous but non-uniform ⓘ |
| isNonUniform | true ⓘ |
| measuredIn |
days
ⓘ
hours ⓘ seconds ⓘ |
| monitoredBy | IERS Earth Orientation Center NERFINISHED ⓘ |
| partOf | Universal Time system NERFINISHED ⓘ |
| referenceLongitude | 0 degrees ⓘ |
| referenceMeridian | prime meridian ⓘ |
| relatedTo |
UT0
ⓘ
UT2 ⓘ |
| standardizedBy | International Astronomical Union NERFINISHED ⓘ |
| successorOf | Greenwich Mean Time NERFINISHED ⓘ |
| symbol | UT1 ⓘ |
| timeScaleClass | Earth rotation time scale ⓘ |
| timeScaleType | solar time scale ⓘ |
| tracks | mean solar time at the prime meridian ⓘ |
| usedFor |
Earth orientation studies
ⓘ
astronomy ⓘ precise navigation ⓘ spacecraft tracking ⓘ |
| usedIn |
VLBI measurements
ⓘ
geodesy ⓘ radio astronomy ⓘ satellite orbit determination ⓘ |
| usedToDefine | leap seconds in Coordinated Universal Time ⓘ |
Referenced by (2)
Full triples — surface form annotated when it differs from this entity's canonical label.
subject surface form:
Terrestrial Time
this entity surface form:
Universal Time