A second full moon in a calendar month will occur on May 31 and be best seen at moonrise on May 30. Why is the Blue Moon one of astronomy’s most misunderstood terms?

The second full moon of May — a blue moon — will make an appearance this weekend.

The blue moon will be the second of two full moons in the same month, a coincidence that only takes place about every two and ...

A rare Blue Moon, the second full moon in May, will also be a "micromoon" near its farthest point from Earth.

A blue moon, May's second full micromoon, will peak in the early morning hours May 31.

Don't miss 2026's smallest full moon with this livestream from Italy with the Virtual Telescope Project. The 'Blue Moon' ...

See the best images of the Blue Moon from around the world as a second dramatic moonrise occurred in the same month in a rare sky event.

Do they really happen "once in a Blue Moon?” ...

The blue moon peaked on May 31, but don't worry if you missed it. Here's when the next full moon will light up the sky.