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

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?

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A rare Blue Micromoon will appear on May 31, 2026, giving skywatchers a chance to witness one of the years most unusual lunar events. A Blue Moon refers to the second full moon…