Next one is in 2018 I read. Can't find link. 'Blue moon" refers to the second full moon in a month. It may or may not have an actual blue hue to it, but if you can catch it at right time it might.
Originally Posted by porschephiliac
A blue moon is an additional full moon that appears in a subdivision of a year: either the third of four full moons in a season, or a second full moon in a month of the common calendar.
The phrase has nothing to do with the actual color of the moon, although a literal "blue moon" (the moon appearing with a tinge of blue) may occur in certain atmospheric conditions: e.g., when there are volcanic eruptions or when exceptionally large fires leave particles in the atmosphere.
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