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A blue moon is a rare lunar event in which the moon appears blue due to atmospheric conditions. It is called a blue moon because it is a rare occurrence, not because the moon itself appears blue. The term "blue moon" was first used in the 19th century to describe a rare lunar event, but it was not until the 20th century that it became commonly used to describe a full moon that occurs when there are two full moons in a single month. This happens about once every 2.7 years. The blue color of the moon during a blue moon is caused by the scattering of sunlight through Earth's atmosphere. The blue color is usually very faint and may not be noticeable to the naked eye.
it's known as a full moon
the blue moon appears every 2 and a half years