In pictures: The rare super blue moon | CNN

A super blue moon — a rare cosmic combination of a supermoon and a blue moon — could be seen in the sky on Monday.

The last time this lunar event occurred was August 2023.

A supermoon occurs when the moon is near or at its closest point to Earth (or, in scientific terms, its perigee) while also appearing full. Approximately one-quarter of all full moons are supermoons.

Blue moons, however, are much rarer — a mere 3% of full moons. It doesn’t mean the moon actually appears blue, though. It is just the term commonly used when two full moons appear within the same calendar month.