A supermoon occurs whenever a full moon coincides with the moon approaching its closest distance to the Earth—a point, known as perigee, that’s about 226,000 miles away—during its 27-day orbit, though NASA does not recognize it as an official astronomical term.

Not only is it a supermoon, meaning our lunar satellite will be slightly brighter and closer, but it's the last supermoon we'll see for a long time.