COLUMBUS (WCMH) — Mark your calendars. On the night of Monday, Nov. 14, you’ll see the biggest moon in the sky in 70 years!

Supermoons aren’t all that rare. They happen when a full moon makes a close pass to earth, making it appear 14 percent bigger and 30 percent brighter.

But the supermoon on November 14 will be very rare.

“The full moon of November 14 is not only the closest full moon of 2016, but also the closest full moon to date in the 21st century,” NASA said in a news release.

It will also be the only supermoon of 2016 to be completely full. It’s also the closest moon to Earth since 1948, back when a gallon of gas cost just 16 cents.

“When the moon is near the horizon, it can look unnaturally large when viewed through trees, buildings, or other foreground objects,” NASA said. “The effect is an optical illusion, but that fact doesn’t take away from the experience.”

The moon won’t appear to be this big again until 2034.