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?

Add Yahoo as a preferred source to see more of our stories on Google. May 31, 2026 at 4:43 a.m. ET brings us a rare Blue Moon—the second full Moon occurring within a single calendar month—making this ...

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

This only happens once in a blue moon, literally. May's second full moon is almost here, and not only is it a rare blue moon, but it will also be a micromoon. The blue moon will take place soon, ...

A rare celestial event is set to light up the night sky this weekend, as what is known as a blue moon rises on May 31. But despite its famous name, stargazers should not expect to see anything blue.

Forbes contributors publish independent expert analyses and insights. An award-winning reporter writing about stargazing and the night sky. The so-called Blue Moon rose at dusk on Saturday, May 30, ...

You’ve probably heard the phrase “once in a blue moon” used to describe something that happens rarely — and that makes sense, given that a blue moon usually refers to the second full moon to hit in ...

See more of our trusted coverage when you search. Prefer Newsweek on Google to see more of our trusted coverage when you search. A rare blue moon will rise this weekend, marking the second full moon ...