Astronomy Day + International Observe the Moon Night = Weekend of Fun
Twice a year — one day each spring and fall — Astronomy Day is celebrated worldwide. Amateur astronomy clubs, planetariums, science museums, and other institutions sponsor events to share the wonders and excitement of astronomy with their communities. The theme of Astronomy Day is “Bringing Astronomy to the People,” and that’s something many astronomy fans can hardly wait to do — share their enthusiasm and knowledge. Each Astronomy Day is a festival of fun, featuring star parties, workshops, planetarium shows, and similar programs aimed a general audience.
Originally a solo spring event, in 2007 the Astronomical League began promoting an autumn Astronomy Day, celebrated between mid-September and mid-October on a Saturday close to the first-quarter Moon. In 2015, Fall Astronomy Day is September 19th. Details