Societies 

American Association of Variable Star Observers                http://www.aavso.org/

American Meteor Society                                                     http://www.amsmeteors.org/

Association of Lunar and Planetary Observers                    http://alpo-astronomy.org/

Astronomical League                                                            https://www.astroleague.org/

Astronomical Society of the Pacific                                      https://www.astrosociety.org/

International Dark-Sky Association                                      http://www.darksky.org/

International Association of Double Star Observers            http://www.iadso.org/

International Meteor Organization                                        http://www.imo.net/

International Occultation Timing Association                        http://occultations.org/

The Planetary Society                                                          http://planetary.org/