The Google team has unveiled an update to Google sky with loads of goodies… notably (to me any way) the sky as seen by astronomers in the 17th century including overlays of Constellation maps from the David Rumsey collection and the U.S. Naval Library. And the big news in this update has got to be the availability of Sky, Moon and Mars imagery in the Google Maps API. This allows any developer to build interesting applications and websites using Sky imagery, and extend the Sky experience to any place on the web. Some early examples of these applications include the Cosmic Visibility page and even an iPod touch hack. WOW!