Thanks to the combination of frequently clear and cloudless skies, low humidity, and calm night air, southern Arizona has some of the best conditions for astronomical observations in the continental US. Three of the world’s premier observatories, — Kitt Peak National Observatory, Mount Graham International Observatory, and the Fred Lawrence Whipple Observatory — are located here. In addition to the Catalina Sky Survey atop Mt Lemmon, there are also another 85 amateur and semi-professional observatories within 180 miles of Tucson.
Many amateur astronomers choose to live in or visit Arizona for the opportunity to take advantage of our pristine skies. The Tucson Amateur Astronomical Association (TAAA) is one of the most active astronomy clubs in the nation.
Some of the local observatories (Whipple, Kitt Peak, Mt Graham and Mt Lemmon) offer educational tours and experiences, and TAAA holds regular events in parks and communities throughout the area.