This is a pebble moonphase app.  It starts at the current moon phase and you
can view coming/previous moon phases with the up/down buttons.  Pressing select
will return to the current day.

The moon phase calculation is a bit shoddy and doesn't account for time zones.

The moon image really turned out better than I thought it would.

Useful references:

http://www.ben-daglish.net/moon.shtml
http://eclipse.gsfc.nasa.gov/phase/phases1901.html
http://en.wikipedia.org/wiki/File:Moon_phases_en.jpg
http://en.wikipedia.org/wiki/File:FullMoon2010.jpg
http://en.wikipedia.org/wiki/Midpoint_circle_algorithm