Its official name is the perigee-syzygy, meaning the moon is both full and closest to Earth. But many call it the supermoon, and Monday's version will be a "showstopper," NASA says. It's the nearest supermoon in almost 70 years — and we won't see another like it until 2034.
"When a full moon makes its closest pass to Earth in its orbit it appears up to 14 percent bigger and 30 percent brighter, making it a supermoon," NASA says.
Here are five things to help you enjoy this supermoon:
When To See It