IAU 1991 Resolution A4
E497210
IAU 1991 Resolution A4 is an International Astronomical Union standard that formalized modern relativistic time scales and reference systems used in astronomy and geodesy.
Observed surface forms (1)
| Surface form | Occurrences |
|---|---|
| IAU 1991 resolutions | 1 |
Statements (51)
| Predicate | Object |
|---|---|
| instanceOf |
IAU resolution
ⓘ
astronomical standard ⓘ time scale standard ⓘ |
| adoptedAt | 21st General Assembly of the IAU NERFINISHED ⓘ |
| adoptedBy | International Astronomical Union NERFINISHED ⓘ |
| adoptedInCity | Buenos Aires NERFINISHED ⓘ |
| adoptedInYear | 1991 ⓘ |
| appliesTo |
VLBI observations
ⓘ
high-precision time and frequency transfer ⓘ satellite geodesy ⓘ solar system dynamics ⓘ spacecraft navigation ⓘ |
| basedOnTheory | general relativity ⓘ |
| defines |
Barycentric Celestial Reference System
NERFINISHED
ⓘ
Barycentric Coordinate Time NERFINISHED ⓘ Geocentric Celestial Reference System NERFINISHED ⓘ Geocentric Coordinate Time NERFINISHED ⓘ Terrestrial Time NERFINISHED ⓘ metric tensors for barycentric and geocentric reference systems ⓘ relationship between TCB and TCG ⓘ relationship between TCG and TT ⓘ relationship between coordinate times and proper time ⓘ relativistic equations of motion for artificial satellites ⓘ relativistic equations of motion for celestial bodies ⓘ relativistic framework for reference systems ⓘ relativistic scaling of mass parameters ⓘ relativistic scaling of space-time coordinates ⓘ relativistic scaling of spatial coordinates ⓘ relativistic scaling of time coordinates ⓘ relativistic treatment of Doppler effect ⓘ relativistic treatment of aberration ⓘ relativistic treatment of astrometric observables ⓘ relativistic treatment of frequency transfer ⓘ relativistic treatment of gravitational time delay ⓘ relativistic treatment of light propagation ⓘ relativistic treatment of parallax ⓘ relativistic treatment of time transfer ⓘ |
| field |
astrometry
ⓘ
astronomy ⓘ celestial mechanics ⓘ geodesy ⓘ relativistic reference systems ⓘ timekeeping in astronomy ⓘ |
| language | English ⓘ |
| purpose |
to formalize modern relativistic reference systems
ⓘ
to formalize modern relativistic time scales ⓘ to provide a consistent relativistic framework for celestial mechanics ⓘ to provide a consistent relativistic framework for geodesy ⓘ to provide a consistent relativistic framework for high-precision astrometry ⓘ |
| supersededInPartBy |
IAU 2000 resolutions on reference systems
NERFINISHED
ⓘ
IAU 2006 resolutions on time scales NERFINISHED ⓘ |
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:
IAU 1991 resolutions