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https://www.space.com/15455-blue-moon.html
A “Blue Moon” is a fairly infrequent phenomenon involving the appearance of an additional full moon within a given period.
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 2.5 years, according to NASA. More recently, the term Blue Moon has been applied to the second full moon within a single calendar month. There are roughly 29.5 days between full moons, making it unusual for two full moons to fit into a 30- or 31-day-long month. (This means that February will never have a Blue Moon.)
The next monthly Blue Moon (a second full moon that appears in a single month) will be on Oct. 31, 2020, according to NASA. The last one was on March 31, 2018. There was a seasonal Blue Moon on Saturday, May 21, 2016, and the next one will be in the spring of 2019. The third full moon of that season will be on May 18, 2019.
ok that much i can understand, I think I was more asking what mystical properties would it have
