A Supermoon happens when a Full Moon or New Moon coincides with the Moon's closest approach to Earth; also called perigee.
Next Supermoon December 2017
The next Supermoon will be on December 3, 2017.
The Supermoon on November 14, 2016, was the closest since January 26, 1948. The next time a Full Moon will come even closer to Earth is on November 25, 2034 (dates based on UTC time).