- International Astronomical Union (IAU)
Promotes and safeguards the science of astronomy in all its aspects through international cooperation. The sole internationally recognised authority for assigning designations to celestial bodies and surface features on such bodies.
www.iau.org
- International Dark-Sky Association
Nonprofit membership-based organization that aims stop the adverse environmental impact of light pollution and space debris.
www.darksky.org
- American Association of Variable Star Observers (AAVSO)
Both amateur and professional.
www.aavso.org
- Astronomical Society of the Pacific
International nonprofit organization offering educational programs and products, research publications, and membership benefits.
www.astrosociety.org
- Royal Astronomical Society
Publishes journals, awards medals, fellowships and prizes. Houses one of the most comprehensive libraries and archives in the world.
www.ras.org.uk
- Czech Astronomy Society
Events, links, articles from leading Czech and foreign magazines.
www.astro.cz
- Association of Universities for Research in Astronomy (AURA)
Serves the entire astronomical community by providing modern, major facilities to qualified scientists from many institutions.
www.aura-astronomy.org
- S.P.A.C.E: Science Popularisation Association of Communicators and Educators
Involved in the promotion of astronomy and scientific temper in educational institutions.
www.space-india.org
- Gay, Lesbian and Bisexual Members of the Astronomical Community (GLBASTRO)
Forum for support and networking between lesbian, bisexual, gay, transsexual, etc. members of the astronomical community.
www.noglstp.org
- Texas Astronomical Society of Dallas
Chartered in 1955 to promote the study of astronomy and related fields and to pursue observation and construction of instruments as a hobby.
www.texasastro.org
- Planetary Studies Foundation
Nonprofit sponsoring educational astronomy programs in Palatine, IL. Links to astronomy articles and tutorials online.
www.planets.org
- National Academy of Sciences Board on Physics and Astronomy
www.nas.edu/bpa
- Leicester University Astronomy Society
Guides to the night sky: galaxies, clusters, nebulae, stars and planets. Tour the observatories, telescopes, events, the month-by-month calendar and ask an astronomer.
www.star.le.ac.uk/astrosoc
- UT Austin - Astronomy Students' Association
www.utexas.edu/students/astro
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