Google Sky Map turns your Android-powered mobile phone into a window on the night sky.
Figure out what you're looking at
Point your phone at the sky, and Google Sky Map will show the stars, planets, constellations, and more to help you identify the celestial objects in view. You can also browse the skies in manual mode.
Search the skies
Search the night sky for your favorite planet, Messier object, and more. Then move the phone in the direction of the arrow to find it in the sky around you.
Link:
http://www.google.com/mobile/skymap/
