- American Association of Variable Star Observers (AAVSO)
Both amateur and professional.
www.aavso.org
- 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
- Astronomical Society of the Pacific
International nonprofit organization offering educational programs and products, research publications, and membership benefits.
www.astrosociety.org
- Czech Astronomy Society
Events, links, articles from leading Czech and foreign magazines.
www.astro.cz
- 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
- National Academy of Sciences Board on Physics and Astronomy
www.nas.edu/bpa
- Planetary Studies Foundation
Nonprofit sponsoring educational astronomy programs in Palatine, IL. Links to astronomy articles and tutorials online.
www.planets.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
- 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
- SETI Institute (2)
dir.yahoo.com/.../Organizations/SETI_Institute
- 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
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