On AppleStore
http://itunes.apple.com/us/app/cosmos-story-vol1/id534188282?mt=8
On Google Play : https://play.google.com/store/apps/details?id=com.cosmostory.cosmosstoryfull
http://www.cosmos-story.com
The first guided tour of the sky for iPhone/iPad.
Get an astronomer in you pocket to guide you throw the sky and pintpoint astral bodies further and further.
After the great success of Nuit des Etoiles in France, CosmoStory as adapted this app in english.