Gyrocade has Starlight – Mobile Planetarium (iTunes Link) for the iPhone, iPod Touch, iPad in the iTunes App Store for FREE for a limited time.

Point your iPhone like a magic lens into the night sky, and see in real time what stars, planets, and constellations hover above. Starlight features the smoothest navigation available on the app store, at a blazing 60 frames per second. Not only is this planetarium app fast, it’s beautiful to look at. See constellations come to life against a vibrant backdrop of stars, each colored according to their actual stellar classification. Amaze your friends and educate your kids with this impressive app.