America is remembering the recent passing of astronaut Niel Armstrong with tonight’s blue moon. “The next time you walk outside on a clear night and see the moon smiling down at you, think of Neil Armstrong and give him a wink,” the Armstrong family said.

Tonight’s blue moon isn’t as rare as it sounds since it happens every 2.7 years.  The term “blue moon” is something of a misnomer. There’s no reason for the full moon to be any bluer than usual. Instead, it has to do with the extra occurrence of a full moon in a given calendar cycle. Read all about it here.