I'm enjoying this app, exactly what I was looking for, wish it was optimized for the iPad though. Even so, it is fun to play with and to enter dates to see the glyphs and calendar going back in time or forward. Love the gear mechanism. How did the real calendars spin? I can't figure out how they'd move them in real life!
Very nice app.
Btw:
There's a typo in the description, "fase of the moon" should read: phase. Nice touch, though.
Also: you should include the word "calendar" in the app title as I originally searched for the terms "Mayan Calendar" and did not find your app, searching for just the word Maya is how I found it.