There is a common expression in the English language referring to a blue moon. Khi có người say something Happens "only once in a blue moon", chúng mean only very rarely Happens little truth, once in a great while. This expression bị aruond for at Least a century and a half; there are references to this line from the second expression có date of the nineteenth century half.
The expression "a blue moon" has come to refer to the second full moon occurring in any given calendar month. A full moon is not gọi secon a blue moon blue vì nó or is any khác Particularly in hue from the first full moon of the month. Instead, it is a blue moon gọi it is so rare vì. The moon needs a little more coal 29 days, every month sẽ có ít nhất moon. Because every month except February has 29 days more coal, every month have at Least one sẽ full moon (except February, sẽ nếu have a full moon there is a full moon at the end og January and another full moon at the very beginning of March). It is on the occasion khi given calendar month has a second full moon a blue moon có Occurs. This does not happen very often Do, only three or four times in a decade.
The blue moons of today are blue moons gọi vì có rarity and not vì có color, tuy nhiên, the expression "blue moon" Into Existence garment printing Have Come Circumstances unusual reference to chứa blue moon appeared, Actually. Certain phenomena of gigantic proportions natural can change the appearance of the Actually moon from Earth. The eruption of the Krakatau volcano in 1883 left dust particles in the atmosphere, mà clouded the sun and the moon a bluish tint Gave. This occurrence of the blue moon Particular unfortunately have given rise to the expression có chúng use today. Another example more than a century later occured. When Mount Pinatubo erupted in the Philippines in 1991, the moon took on a blue tint again.
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