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There Will Be a Blue Moon on Halloween This Year

There Will Be a Blue Moon on Halloween This Year, So Get Ready For an Extraspooky Night

Get ready for an extraspooky Halloween this year, because the astronomical phenomenon known as a blue moon is happening on none other than Oct. 31.

But what exactly is it? A blue moon refers to the second full moon in one month, and it's pretty rare (hence the phrase "once in a blue moon"). A full moon occurs every 29 days, so there's usually only one full moon per month. And blue moons, which aren't actually blue in color, occur only once every two and a half to three years, according to NASA.

Though a full moon might not seem so special, a full moon that falls on Halloween only happens three or four times a century. And according to AccuWeather meteorologist Brian Lada, after this year, you won't see another blue moon on Halloween until 2039! We don't know about you, but we already can't wait.

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