Scientists Confirm Existence of Moon

I think this is pretty cool. Calibrating a detector by basically doing the opposite of how you would normally calibrate an instrument.

It’s important in this game to make sure your detector is really “pointing” where you think it is. (Ice Cube doesn’t move, of course; the detectors find tracks in the ice, from which a direction is reconstructed.) So it would be nice to have a source of muons to check against. Sadly, there is no such source in the sky. Happily, there is an anti-source — the shadow of the Moon.