The full moon will loom higher in the night sky this December than it will for nearly the next two decades. Due to a rare event involving the moon’s orbit that occurs only every 18.6 years, next month’s full moon, dubbed the Cold Moon, will reach the absolute extreme.
To top it off, December’s full Cold Moon will seem significantly bigger and brighter than usual as it'll be a supermoon—the last of three supermoons in 2025.
