International Year of Astronomy 2009

http://www.astronomy2009.org/

International Astronautics Federation

http://www.iafastro.org/

Astronomers Without Borders (AWB) / Global Astronomy Month (GAM)

http://www.astronomerswithoutborders.org/

The world at night (TWAN)

http://www.twanight.org/newTWAN/index.asp

Instituto di Radioastronomia – Medicina Radiotelescopes
http://www.med.ira.inaf.it/index_EN.htm

International Astronomical Union
http://www.iau.org/

Project Hessdalen
http://www.hessdalen.org/index_e.shtml

Science Camp
http://www.sciencecamp.no/

CNES/GEIPAN
http://www.cnes-geipan.fr/

Unusual Aerial Phenomena Study Group
http://www.uapsg.org/