| Term | Definition |
|---|---|
| ITRS | International Terrestrial Reference System |
| IUGG | International Union of Geodesy and Geophysics |
| IVS | International VLBI Service for Geodesy and Astrometry |
| JGR | Journal of Geophysical Research |
| JPL | Jet Propulsion Laboratory, USA |
| LAREG | Laboratoire de Recherche en Géodésie, France |
| LEGOS | Laboratoire d’Etudes en Géophysique et Océanographie Spatiales, France |
| LEO | Low Earth Orbit |
| LGGE | Laboratoire de Glaciologie et de Géophysique de l'Environnement |
| LLR | Lunar Laser Ranging |
| MOE | Medium Orbit Ephemerides |
| NASA | National Aeronautics and Space Administration, USA |
| NOAA | National Oceanic and Atmospheric Administration, USA |
| NUVEL-NNR | Northwestern University velocity model, no net rotation |
| OCA | Observatoire de la Côte d'Azur, France |
