Time-lapse image of a Super Blue Moon above the Monsaraz Castle in Portugal. A Super Moon is defined as a full moon near perigee, the Moons closest point in its orbit around the Earth. During this event, because the full moon is a little bit closer to us than usual, it appears especially large and bright in the sky. A blue moon is the term for when we see the full moon twice in a single month. Image captured from the Dark Sky Alqueva region in Portugal.