basically it's a star guide. You point your camera in the sky and it tells you where all the constellations are.
Thanks for the tease...got a link?
__________________
"Beware of the man who works hard to learn something, learns it, and finds himself no wiser than before. He is full of murderous resentment of people who are ignorant without having come by their ignorance the hard way. " -- The Books of Bokonon