| le.ac.uk | International Organisations for Archaeoastronomy and Cultural Astronomy |
| iau.org | The International Astronomical Union (IAU) |
| iap.fr | European Astronomical Society (EAS) |
| ku.dk | International Association of Geodesy |
| astrosociety.org | Astronomical Society of the Pacific |
| astroleague.org | The Astronomical League |
| aavso.org | American Association Of Variable Star Observers (AAVSO) |
| obspm.fr | International Earth Rotation Service (IERS) |
| arizona.edu | Association of Lunar and Planetary Observers |
| gnat.org | Global Network of Astronomical Telescopes (GNAT) |
Australia , South Australia , Adelaide