The major organization of professional astronomers in North America, established in 1899. Holds annual meetings, publishes scholarly journals, maintains a job board, and advocates for the astronomical sciences.
Scientific and educational organization founded in 1889. Name derives from its origins on the Pacific Coast but membership and activities are national and international in scope.
UK-based professional society of physicists with worldwide membership. Publishes numerous leading physics and astronomy journals with partner organizations.
International association of professional astronomers founded in 1919. Holds several international symposia each year, defines astronomical nomenclature, and serves as the authority for naming celestial bodies and their features.
UK-based scientific society that promotes the study of astronomy, geophysics, and other related branches of science. Founded in 1820 as the Astronomical Society of London.
