| iau.org | The International Astronomical Union (IAU) |
| assa.org.au | The Astronomical Society of South Australia |
| occultations.org | International Occultation Timing Association (IOTA) |
| obspm.fr | International Earth Rotation Service (IERS) |
| le.ac.uk | International Organisations for Archaeoastronomy and Cultural Astronomy |
| iap.fr | European Astronomical Society (EAS) |
| gnat.org | Global Network of Astronomical Telescopes (GNAT) |
| darksky.org | International Dark-Sky Association (IDA) |
| corvus.com | The American Association Of Amateur Astronomers |
| astrosociety.org | Astronomical Society of the Pacific |
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