This is an idea for an iPhone app. The app is a compass for locating the moon. There is not any practical use that I can imagine.
Using GPS location, or possibly even ZIP code, the app employs the aid of the accelerometer to help you point your phone directly at the moon, day or night. Someone must
know where the moon is, was, and will be, and they've probably got a set of equations to help with the programming.
I think we can all agree it would be nifty to display the phase of the moon that we're trying to locate.
Zen is a finger pointing at the moon. If you look at the finger, you'll miss the point. Nothing simpler.