Snopes:

On November 14 2016, the confluence of two celestial events will create what will appear to be the largest full moon (or a “supermoon”) since Harry S. Truman was president of the United States,

Two events must coincide to create the experience of a supermoon. The first is the presence of a full moon (which occurs around every 29.53 days) and the second is the moon’s closest approach to Earth, which occurs every 27.32 days,

This “extra-super rating” is no exaggeration — it is quite rare for these two events to peak within two hours of each other.

Unlike some previous “supermoons”, this one will actually be noticeably larger so, if you can, get out and enjoy it. And, if you’re a photographer, here are some tips on “How to Take a Non-Crappy Picture of the Moon“.