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'Once In A Blue Moon' Is Happening Again This Halloween. A partially eclipsed super blue blood moon sets behind the Golden Gate Bridge on Jan. 31, 2018, in San Francisco. The "super blue blood moon" is a rare "lunar trifecta" event and was the first such lunar event seen in North America since 1866.  Justin Sullivan/Getty Images  hide caption toggle caption Justin Sullivan/Getty Images A partially eclipsed super blue blood moon sets behind the Golden Gate Bridge on Jan. 31, 2018, in San Francisco. The "super blue blood moon" is a rare "lunar trifecta" event and was the first such lunar event seen in North America since 1866. Justin Sullivan/Getty Images This year, there will be a full moon on Halloween. This makes it a "blue moon," since it's the second full moon in one calendar month. This phenomenon usually happens around  every 2.7 years . So maybe something that happens "once in a blue moon"  isn't actually...