American Association of Variable Star Observers

http://www.aavso.org

American Astronomical Society

http://www.aas.org

The American Lunar Society

http://otterdad.dynip.com/als

Antique telescope society

http://www1.tecs.com/oldscope

Association of Lunar and Planetary Observers

http://www.lpl.arizona.edu/alpo

Astronomical league

http://www.astroleague.org

Astronomical Society of South Australia

http://www.assa.org.au

British Astronomical Association

http://www.ast.cam.ac.uk/~baa

International Dark-sky Association

http://www.darksky.org

The International Meteor Organization

http://www.imo.net

The planetary society

http://planetary.org

Rede de Observação Observacional

http://www.reabrasil.org

Royal Astronomical Society

http://www.ras.org.uk

The webb society

http://www.webbsociety.freeserve.co.uk