American Astronomical Society (AAS)
Established 1899, AAS is the major professional organization in North America for astronomers, other scientists and individuals interested in astronomy.
European Astronomical Society (EAS)
An association founded under the Swiss Civil Code in 1990. Its purpose is to contribute to and promote the advancement of astronomy in Europe.
International Association of Geodesy
Member information, meeting announcements, publications and reports, awards, and links to related sites.
International Earth Rotation Service (IERS)
Works to maintain the International Celestial Reference System and Frame, and the International Terrestrial Reference System and Frame, and to provide timely and accurate data on the Earth's orientation for current use and long-term studies. Site describes the group's structure and function.
International Occultation Timing Association: European Section (IOTA/ES)
A project consisting of predictions and data for the moon, asteroids, and planets.
International Organisations for Archaeoastronomy and Cultural Astronomy
Provides general information for the European Society for Astronomy in Culture and International Society for Archaeoastronomy and Astronomy in Culture.
Joint Organization for Solar Observations (JOSO)
Facilitates collaboration in solar physics among European solar astronomers. Contains details about JOSO's aims, structure, meetings and working groups.
Royal Astronomical Society of Canada
Key activities include research and observing planets, stars, celestial phenomena and the abatement of light pollution.
The Astronomical Society of South Australia
Founded in 1892, is the oldest society of its kind in Australia. Its objectives are to promote the Science of Astronomy and all its branches by holding regular meetings and viewing nights, circulating current astronomical information, and encouraging popular interest.
The International Astronomical Union (IAU)
Founded in 1919, has a mission to promote and safeguard the science of astronomy through international cooperation. The organization is also the internationally recognized authority for assigning designations to celestial bodies and surface features on such bodies.