Google Sky Map

Google Sky Map helps you to explore the Universe using your Android phone.

     This practical app lets you point the exact location of the stars, planets and
other celestial objects in the night sky.
Simply point your phone at the sky and you'll see details of exactly what's up
there represented by a map in Google Sky Map.

(  https://play.google.com/store/apps/details?id=com.google.android.stardroid&hl=en  )