A blue moon is not actually blue in color; it is simply the second full moon that occurs within a single calendar month. This phenomenon happens because the lunar cycle is approximately 29.5 days long, so when a full moon occurs near the beginning of a month, there is just enough time for a second full moon to appear at the month's end. The term 'blue moon' is a historical misnomer that has persisted despite not describing the moon's actual color.
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A rare “blue moon” will rise on May 31stAdded:
Heads-up sky watchers, there's a blue moon coming May 31st. Now, before you get too excited, it won't actually look blue. The name is a bit misleading. A blue moon is simply the second full moon in a single month. It's all about timing. The moon cycle is about 29 and 1/2 days long, so if you get a full moon at the beginning of the month, there's just enough time to squeeze in one at the end. That's what's happening this month. If skies are clear on the 31st, head outside at 9:22 to catch this not-so-blue, but pretty special full moon.
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