Electronic Star Charts

Star Walk - $4.99
Star Walk covers about 9000 stars, planets, and constellations and comes with Time Machine and Lunar Phase features. Star Walk is virtual astronomy for anyone who is interested in stargazing, amateurs, or more professional astronomers. Use the Star Spotter function to activate the DIGITAL COMPASS on 3GS only, find your orientation and you will see the sky in front of you in real-time. You can pan the iPhone's display and watch the stars scroll around.

Astro App - Free
Explore the night sky, Mars, or our old moon with the help of Google Sky. Tap on the map to pan around quickly and zoom in to examine craters, spots, or nebulas in more detail.

The Night Sky - $0.99
The Night Sky is an app that enables you to identify the stars, planets, galaxies, constellations, and even satellites you can see above. Just stand anywhere and hold your iPhone, iPod touch or iPad up to the sky and The Night Sky will display the names of the stars, planets and other objects you are able to see.

SkyView - $1.99
SkyView® brings stargazing to everyone. Simply point your iPhone, iPad, or iPod at the sky to identify stars, constellations, planets, satellites, and more!

Star Atlas - Free
Charts contain over 25,000 stars to magnitude 7.5 and 346 deep sky objects including all Messier objects. Almost all objects have visual magnitude 10 or brighter. There is also a list of over 150 double stars.