What Is a Blue Moon?

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What Is a Blue Moon?







A "blue moon" is a fairly rare phenomenon that implies the appearance of an additional full moon within a certain period. But in what period? It turns out that there are two definitions of the term, and one arose from a misunderstanding of the other.



	

	The oldest meaning defines a Blue Moon as the third full moon in a season that has four full moons. Call to seasonal blue moon, this occurs approximately every 2.5 years, according to NASA. More recently, the term Blue Moon has been applied to the second full moon in a single calendar month. There are approximately 29.5 days between full moons, which makes it unusual for two full moons to enter a month of 30 or 31 days. (This means that February will never have a blue moon).

		Which one is correct? Well, since the language and meaning of words constantly evolve, choose your option. Both are commonly used today and any of the definitions is considered valid. As Texas astronomer Donald W. Olson wrote in a 2006 column for Sky & Telescope magazine, "With two decades of popular use behind it, the second interpretation of the full moon in a month (mis) is like a genius You can not force him to return to his bottle, but that's not necessarily a bad thing. "

		The next monthly Blue Moon (a second full moon that will appear in a single month) will be October 31, 2020. according to the nasa. The last one was on March 31, 2018. There was a blue moon of season 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 May 18, 2019.



		Origin of the term.

		The phrase "once in a blue moon" has existed for more than 400 years, according to Philip Hiscock, a folklorist at the Memorial University of Newfoundland. in a Article 2012 in the Sky & Telescope magazine.He explained that the first use of the term was very similar to saying that the moon is made of green cheese, which indicated something absurd. "I would argue that the moon is blue" was similar to saying: "I would argue that black is white."

		The meaning evolved into something like "never," according to Hiscock. "I'll marry you when the moon turns blue" became the equivalent of "I'll marry you when the pigs fly."

		"Most blue moons look pale gray and white, indistinguishable from any other moon you've seen" according to the nasa. "Squeezing a second full moon in a calendar month does not change the physical properties of the moon, so the color remains the same."

		But, never say never. It turns out that the moon can They appear bluish, as happened in 1883 after the the Krakatoa volcano erupted. The dust in the air acted as a filter, causing the sunsets and the moon to turn green and blue around the world, an event that, according to NASA, is believed to have generated the phrase "Blue Moon"Other events such as wildfires and dust storms can make the moon turn blue.

		Then, the meaning of "once in a blue moon" changed from "never" to "rarely," according to Hiscock.     



		When does a blue moon occur?

		Now we come to the contradictory programming definitions of Blue Moon.

		The seasonal definition of the term Blue Moon dates back to the August 1937 issue of Maine Farmer's Almanac, which explained that the moon "usually fills 12 times a year, three times a season, but occasionally there will be a year. in which there are 13 full moons during a year, not the usual 12. And that extra full moon also meant that one of the four stations would contain four full moons instead of the usual three. " 

		The almanac followed certain rules on how to call each moon. For example, the last full moon of winter had to fall during Lent; It was called the Lenten moon. The first full moon of spring was called Egg Moon, or Easter Moon, or Easter Moon, and had to fall within the week before Easter. There was also the Moon Before Yule and the Moon After Yule. Then, when a particular station had four moons, the third was called the Blue Moon, so that the other full moons could occur at the appropriate times in relation to the solstices and equinoxes.





												<img class = "pure-img lazy" big-src = "https://www.space.com/images/i/000/019/897/original/blue-moon-august-2012-120726b-02.jpg ? 1376950751 "src = data 'https://img.purch.com/w/640/aHR0cDovL3d3dy5zcGFjZS5jb20vaW1hZ2VzL2kvMDAwLzAxOS84OTcvaTAyL2JsdWUtbW9vbi1hdWd1c3QtMjAxMi0xMjA3MjZiLTAyLmpwZz8xMzc2OTUwNzUx' alt =" Designed to be called 'blue' after an old English term meaning 'traitor', a blue moon is an extra Full moon that occurs due to a peculiarity of the calendar.

The[[See the complete infographic of the blue moon here.]"data-options-closecontrol =" true "data-options-fullsize =" true "/>


            						    Credit: Karl Tate, SPACE.com 






		But what about the definition that many people have heard: that a Blue Moon is the second full month in a single month? That came from a misinterpretation of the original definition of 1946, which was used as a source for a syndicated radio program nationally in 1980.



	This article was updated on November 15, 2018 by the main writer of Space.com, Meghan Bartels. 



	Additional resources:



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