Explanation:
Once in a blue moon: This poetic phrase refers to something extremely rare in occurrence. A blue moon is the term commonly used for a second full moon that occasionally appears in a single month of our solar-based calendars. The problem with the phrase, however, is that blue moons are not so rare—they happen every few years at least, and can even happen within months of each other when the 29.5-day lunar cycle puts the full moon at the beginning of any month but February.
The usage of “blue moon” as the second full moon in a month dates back to a 1937 Marine Farmer’s Almanac. But prior to that, blue moons meant something slightly different. Typically, 12 full moons occur from winter solstice to the next winter solstice (roughly three per season), but occasionally a fourth full moon in a season could be observed. In such a case, one of the four full moons in that season was labeled “blue.”
Readers may recall that baby Smurfs are delivered to the Smurf village during blue moons. If this were to occur every blue moon, we’d soon be awash in blue creatures three apples high!
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