. . Unfortunately, the moon will not be cooperating for a dark sky when we are in Wyoming. It will be nearly full at that time. However, not all is lost. The moon is not visible for the entire night. The best time for a dark sky is 4:30AM on September 7'th. We'll be at Colter Bay at that time.
. . For those who want to check out their own viewing schedule, here is a handy tool. http://www.moongiant.com/