Sky Guide: View Stars Night or Day (Fifth Star Labs)
Price: $1.99; average rating of 5 based on over 290 users.
Hold your iPad up to the night sky, the compass kicks in, and the app shows you the stars, constellations, planets in your section of the sky, all identified on screen with access to loads of other details. “I always thought astronomy was interesting, but found it difficult to visualize the constellations and discern planets from stars, etc,” reports an iTunes customer. “This makes it easy.” Yes: not a business app, but way cool.