Planisphere is an astronomy application that lets you use pinch and finger gestures to manipulate a map of the sky. As you zoom in finer detail comes into view. You can double tap on objects to get more information. You can use the compass and accelerometer to show the sky in the direction the phone is being held for the selected time. Planisphere shows all 88 constellations and their boundaries, 6096 naked eye stars, the Messier deep sky catalogue, bright NGC objects, the Sun, Moon, planets…