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?

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, ...

Add Yahoo as a preferred source to see more of our stories on Google. A full sturgeon supermoon, also a blue moon, sets behind Rocca Calascio Castle in Calascio ...

A blue moon is not a sign that the moon will look blue. Instead, the phrase usually refers to an extra full moon that does not fit neatly into the calendar. There are two commonly used definitions. A ...

A rare blue moon will rise this weekend, marking the second full moon to appear in a single month. It’s the only calendrical blue moon of the year and will also coincide with a micromoon, when the ...

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, ...

Add Yahoo as a preferred source to see more of our stories on Google. 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 ...