Glossary
- 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
