(CNN) – Have you heard the saying “once in a blue moon” Friday ?, you can use it.
A blue moon will be this July 31, as is known to the second time that a full moon is recorded in the same month. The last such event occurred in August 2012.
Each month has a full moon, but since the lunar cycle and timing are not perfectly synchronized, every three years we have a blue moon.
The first record of the term dates back to 1524 and referred to the third full moon in a season, according to the Institute of Astronomy at UNAM. However, the term was reinterpreted in 1946 cuandoun magazine article Sky and Telescope the defined as the second month.
Contrary to its name, the satellite does not acquire that tone.
Have you ever changes tone Moon? Yes, but chances that has been blue is a result of smoke or dust particles in the atmosphere, for example during a volcanic eruption.
An example occurred in 1883, when the Indonesian volcano Krakatoa erupted throwing so much ash into the atmosphere that the moon got a cerulean hue for years, night after night.
After the massive explosion that scientists believe is compared with a 100-megaton nuclear bomb, they caused the volcanic debris vibrant red sunsets and the moon to acquire a blue tint.
The last time the moon was blue was in Edinburgh, Scotland in September 1950.
The astronomer Robert Wilson of the Royal Observatory observed the event and concluded it was because the light satellite was traveling through a patch of clouds that had particles of smoke and ash from forest fires in Alberta, Canada.
These particles crossed the Atlantic and floated over Scotland during the lunar event, creating a rare spectacle, according to the National Oceanic and Atmospheric Administration of the United States.
The Blue Moon will be until January 2018.
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