Use of cookies
Cookies help us to provide our services. By using our website you agree that we can use cookies. Read more about our Privacy Policy and visit the following link: Privacy Policy
Glossary
The following terms are related to the IERS and to Earth rotation and reference systems in general.
Additions will follow, proposals are welcome.
- barycenter
- Barycentric Coordinate Time (TCB)
- Barycentric Dynamical Time (TDB)
- Celestial Ephemeris Origin (CEO)
- Celestial Ephemeris Pole (CEP)
- Celestial Intermediate Origin (CIO)
- Celestial Intermediate Pole (CIP)
- Celestial Intermediate Reference System (CIRS)
- celestial pole offsets
- Chandler wobble
- coordinate time
- Coordinated Universal Time (UTC)
- datum
- DORIS
- Earth Rotation Angle (ERA)
- ecliptic
- ellipsoid
- epoch
- equation of the equinoxes (EE)
- equation of the origins (EO)
- equinox
- free core nutation (FCN)
- Fifth Fundamental Catalogue (FK5)
- fundamental arguments
- geocenter (geocentre)
- geocenter motion
- Geocentric Celestial Reference System (GCRS)
- Geocentric Coordinate Time (TCG)
- geocentric terrestrial reference system (GTRS)
- geoid
- Global Positioning System (GPS)
- Greenwich Mean Sidereal Time (GMST)
- Greenwich Sidereal Time (GST)
- Hipparcos
- International Astronomical Union (IAU)
- International Atomic Time (TAI)
- International Celestial Reference Frame (ICRF)
- International Celestial Reference System (ICRS)
- International Terrestrial Reference Frame (ITRF)
- International Terrestrial Reference System (ITRS)
- J2000.0
- Julian Day
- leap second
- length of day (LOD)
- LLR
- mean pole
- Modified Julian Day (MJD)
- non-rotating origin (NRO)
- nutation: see precession-nutation
- permanent tide
- polar motion
- pole angles
- precession-nutation
- regularized UT1 (UT1R)
- site displacements
- SLR
- stellar angle: see Earth Rotation Angle
- Temps-coordonnée barycentrique: see Barycentric Coordinate Time
- Temps-coordonnée géocentrique: see Geocentric Coordinate Time
- T eph (Teph)
- Terrestrial Dynamical Time (TDT)
- Terrestrial Ephemeris Origin (TEO)
- Terrestrial Intermediate Origin (TIO)
- Terrestrial Intermediate Reference System (TIRS)
- terrestrial reference frame (TRF)
- terrestrial reference system (TRS)
- Terrestrial Time (TT)
- Universal Time (UT1)
- VLBI
- zonal tides