what do mean by blue moon and when it observed
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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
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Once in a blue moon” is a common expression that has been used for a long time, and which means 'not very often,' or 'very rarely.' It often refers to an extra full moon; however, it has been used to describe the way the moon actually looked, when for different reasons it had turned a blueish color.
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