Blue moon what is the meaning

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Read More. November 08, To top. Sign up for free and get access to exclusive content:. But which period? It turns out there are two definitions of the term, and one was borne out of a misunderstanding of the other. The older meaning defines a Blue Moon as the third full moon in a season that has four full moons. Called a seasonal Blue Moon , this occurs about every 2. More recently, the term Blue Moon has been applied to the second full moon within a single calendar month.

There are roughly This means that February will never have a Blue Moon. Which one is correct? Well, since language and the meaning of words constantly evolve — take your pick. Both are commonly used today and either definition is considered valid. As Texas astronomer Donald W.