The International Astronomical Union (IAU) (Popularity:  )
Founded in 1919, has a mission to promote and safeguard the science of astronomy through international cooperation. The organization is ...
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International Organisations for Archaeoastronomy / Cultural Astronomy (Popularity: )
An association founded under the Swiss Civil Code in 1990. Its purpose is to contribute to and promote the advancement ...
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American Astronomical Society (AAS) (Popularity: )
Established 1899, AAS is the major professional organization in North America for astronomers, other scientists and individuals interested in astronomy.
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European Astronomical Society (EAS) (Popularity: )
An association founded under the Swiss Civil Code in 1990. Its purpose is to contribute to and promote the advancement ...
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American Association Of Variable Star Observers (AAVSO) (Popularity: )
Professional and Amateur collection, research, and analysis of variable star observations.
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Association of Lunar & Planetary Observers (Popularity: )
Founded in 1919, has a mission to promote and safeguard the science of astronomy through international cooperation. The organization is ...
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Global Network of Astronomical Telescopes (GNAT) (Popularity: )
a non-profit organization dedicated to being a catalyst and information source for all those interested in research and education using ...
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Utah Skies (Popularity: )
A very comprehensive collection of information useful and interesting to amateur astronomers, especially those located in Utah. Includes events, news, ...
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The Astronomical League (Popularity: )
is composed of over two hundred local amateur astronomical societies from all across the United States. Find out about our ...
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International Association of Geodesy (Popularity: )
Member information, meeting announcements, publications and reports, awards, and links to related sites.
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International Occultation Timing Association (IOTA) (Popularity: )
was established to encourage and facilitate the observation of occultations and eclipses. It provides predictions for grazing occultations of stars ...
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European Association for Astronomy Education (Popularity: )
Improves and promotes astronomical education at all levels in all institutions involved in teaching astronomy in Europe. Contains membership information, ...
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Astronomical Society of the Pacific (Popularity: )
Disseminates astronomical information. The ASP has become the largest general astronomy society in the world, with members from over 70 ...
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Euro-Asian Astronomical Society (Popularity: )
Maintains the development of astronomy and reinforces scientific contacts between astronomers of the former Soviet Union and their colleagues all ...
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The Planetary Society (Popularity: )
A nonprofit organization that promotes exploration of the solar system and the search for extraterrestrial intelligence.
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Antique Telescope Society (Popularity: )
An international organization of colleagues interested in antique astronomical telescopes, books, binoculars, and related materials.
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International Earth Rotation Service (IERS) (Popularity: )
Works to maintain the International Celestial Reference System and Frame, and the International Terrestrial Reference System and Frame, and to ...
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The Webb Society (Popularity: )
An international society of amateur and professional astronomers specialising in the observation of double stars and 'deep sky' objects, founded ...
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International Occultation Timing Association - European Section (IOTA/ES) (Popularity: )
Key activities include research and observing planets, stars, celestial phenomena and the abatement of light pollution.
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The Astronomical Society of South Australia (Popularity: )
founded in 1892, is the oldest society of its kind in Australia. Its objectives are to promote the Science of ...
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