| Astronomy Institutes |
| ASTRON |
| Arcetri Observatory |
| Association of Universities for Research in Astronomy |
| Astronet |
| Astronomical Calculation Institute (University of Heidelberg) |
| Bosscha Observatory |
| Canadian Institute for Theoretical Astrophysics |
| Cavendish Astrophysics Group |
| Center for Computational Relativity and Gravitation |
| Center of Astronomy (University of Heidelberg) |
| Centre de recherches en géodynamique et astrométrie |
| Centre for Astrophysics and Supercomputing |
| European Northern Observatory |
| European Southern Observatory |
| Harvard College Observatory |
| Harvard–Smithsonian Center for Astrophysics |
| Herzberg Institute of Astrophysics |
| Institut d'astrophysique de Paris |
| Institute for Astronomy |
| Institute of Astronomy of the Bulgarian Academy of Sciences |
| Institute of Astronomy, Cambridge |
| Instituto de Astrofísica de Canarias |
| Istituto di Radioastronomia di Bologna |
| Jodrell Bank Centre for Astrophysics |
| Jodrell Bank Observatory |
| Joint Institute for VLBI in Europe |
| Kapteyn Astronomical Institute |
| Landessternwarte Heidelberg-Königstuhl |
| Leiden Observatory |
| Lick Observatory |
| Lunar and Planetary Laboratory |
| H cont. |
| Mauna Kea Observatory |
| Max Planck Institute for Astronomy |
| Max Planck Institute for Extraterrestrial Physics |
| Max Planck Institute for Radio Astronomy |
| Mount Laguna Observatory |
| National Radio Astronomy Observatory |
| Palomar Observatory |
| San Diego State University College of Sciences |
| Sternberg Astronomical Institute |
| Swinburne University of Technology |
| UK Astronomy Technology Centre |
| University of Amsterdam |
| W. M. Keck Observatory |
| WIYN Consortium |
| Warner and Swasey Observatory |
