Voted for Round Moon

What would Square-moon "Phases" look like? A couple of missing pixels off one side? How could we easily understand the difference between a full and not quite full moon?

I'm assuming that the phase of the moon is important for 'something' (for example: if some enchantments can only work during a full moon, or something like that.)

Change sucks, but honestly, there are bigger issues in minecraft to worry about than the shape of the sun and moon (which most people who care about such minutia, probably use skins anyways).