Source: http://lifehacker.com/5524793/google-skymap-for-android-puts-detailed-star-gazing-in-your-pocket
Android: If you thought exploring the night sky with applications like Stellarium from the comfort of your computer was cool, Google SkyMap gives you real-time and directional star gazing. Point the phone at the sky to see exactly what's up there.
Install Google Sky Map for Android on your phone and you don't just get a chance to scroll through the heavens—although you can switch it to manual mode for fun zooming around—you actually get to see the celestial sphere as you would see it with perfect telescope-vision. Check out the video below to see it in action:
Tilt the phone up towards the sky and you see what's above you, thanks to the GPS, compass, and tilt-sensors in your phone. Tilting it down, by the way, is even more fun as you get to see what's on the other side of the earth—with a powerful enough laser beam I could shoot through my file cabinet, the planet, and nail the moon.
Visit the link below for more information or hop into the Android Market and search for "Sky Map" to grab a copy. Have a tip or trick for using Google Sky Map or just an Android app your itching to share? Let's hear about it in the comments. Thanks TheMoFo!