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For iPhone 3GS, iPhone 4, and iPad on the iTunes App Store\n\nStar Guide's simple interface helps you learn the night sky by displaying the constellation at which your device is currently pointed.\n\nIt uses your device's sensor suite, the magnetometer, accelerometer, and GPS, to determine the orientation of your phone relative to the celestial sphere, using a custom cascading filter for precision and fast response. For best results hold the device at arms length, look along the surface, and tap the screen to pause the display\n\nNote that as an astronomy app, Star Guide comes in a red-and-black color scheme designed to minimize the loss of night-vision. For best results you should turn the screen brightness to minimum before going outside.