I noticed Google Sky on DownloadAtoZ.com's list of Top 10 Android Apps You Must Have.
A quick download and I was amazed. Just point your phone at the sky and it displays the starts, constelations and planets you're seeing (or would be seeing if it wasn't cloudy). See a bright object that's probably a planet? Now you can instantly figure out which planet it is.
While not "essential" to your life, Google Sky Map is a lot of fun, and great to show your friends.
You can also see Google Sky on your PC. It's a feature of Google Earth.
