This index lists groups and organizations, both professional and amateur, dedicated to the study of the night sky. You may be surprised to find that there's an astronomy group very near your home. I am continually adding to this list so be sure to check it often.
Membership is open to both amateur and professional astronomers.
American Astronomical Society Established in 1899, the AAS is the major professional organization for astronomers. Since 1911, the AMS has been dedicated to the observation and research of all things meteroric. Founded by Walter Haas in 1947, the ALPO offers a large amount of information and resources to its members regarding our planetary neighbors. The Astronomical League is composed of over two hundred local amateur astronomical societies from all across the United States. Astronomical Society of Australia Organization of professional astronomers in Australia.