Wow. Great last two lines. A queston to consider:
Do you want the poem to have a kind of accusatory tone? Beginning with "Listen," and then having "you" addressed in line three, makes the poem feel at first like a challenge to the reader. I think the poem might work better with a more astonished feel--change "you" to "us", or change tell to "reveal" and cut any pronoun.
Should you wish to cut listen, you've got two more syllables to play with.

Really like this one!
 

One more thing--the title's kind of flat. I understand "clear" suggests the clarity of the revelation, but literally it's drab. Perhaps "moon" should be in the title (or "Listen" as the title)