Starry+Starry+Night

This is a great program that uses the internal iPad sensors to assess where the user is located. It then displays the night time sky for that space at that time.

The coolest part of the program is that as you move the iPad, the display changes to reflect what you are looking toward. It is most useful in the evening, but you can use it in cool ways during the day also. There are good informational sections to the app about various parts of the night time sky.

It is a good astronomy app. I think it costs $5.99