Moon Phase Calendar This is not just a display of the current moon phase, it's a real-time animated display. (I'm sure you're duly impressed.) Of course, the moon changes phase rather slowly, so unless you don't have much to do today, you'll probably not want to sit there and stare very long waiting for the exciting action to occur. If you click on the moon, however, you'll see a complete phase cycle at a somewhat brisker pace.