Last Supermoon of 2016 Rises Tonight: What to Expect

A supermoon occurs when the moon is full and at its closest point to Earth in its 27-day orbit. December’s full moon follows November's full Beaver Moon and October’s full Hunter’s Moon — both of which are also supermoons. In fact, November’s full moon was the closest to Earth since 1948, and the full moon won't come that close again until Nov. 25, 2034.