A blue moon is an additional full moon that appears in a subdivision of a year: either the third of four full moons in a season , or a second full moon in a month of the common calendar. The phrase in modern usage has nothing to do with the actual color of the Moon , although a visually blue Moon the Moon appearing with a bluish tinge may occur under certain atmospheric conditions — for instance, if volcanic eruptions or fires release particles in the atmosphere of just the right size to preferentially scatter red light.
Full Moon for February 2020
The term has traditionally, in the Maine Farmer's Almanac, referred to an "extra" full moon, where a year which normally has 12 full moons has 13 instead. The "blue moon" reference is applied to the third full moon in a season with four full moons,  thus correcting the timing of the last month of a season that would have otherwise been expected too early.
This happens every two to three years seven times in the Metonic cycle of 19 years. Owing to the rarity of a blue moon, the term "blue moon" is used colloquially to mean a rare event , as in the phrase "once in a blue moon". One lunation an average lunar cycle is There are about Therefore, about In the widely used Gregorian calendar , there are 12 months the word month is derived from moon  in a year, and normally there is one full moon each month.
Each calendar year contains roughly 11 days more than the number of days in 12 lunar cycles. The extra days accumulate, so every two or three years seven times in the year Metonic cycle , there is an extra full moon. The extra full moon necessarily falls in one of the four seasons, giving that season four full moons instead of the usual three, and, hence, a blue moon. The earliest recorded English usage of the term blue moon is found in an anti-clerical pamphlet attacking the Roman clergy, and cardinal Thomas Wolsey in particular by two converted Greenwich friars, William Roy and Jerome Barlow, published in under the title Rede me and be nott wrothe, for I say no thynge but trothe.
The relevant passage reads: . O churche men are wyly foxes [ It is not clear [ according to whom?
The intention may simply be that Jeffrey makes an absurd statement, "the moon is blue", to make the point that priests require laymen to believe in statements even if they are patently false. In the 19th and early 20th centuries, the Maine Farmers' Almanac listed blue moon dates for farmers. These correspond to the third full moon in a quarter of the year when there were four full moons normally a quarter year has three full moons. Full moon names were given to each lunation in a season. The seasons used were those of the mean tropical year , equal in length, as opposed to the astronomical seasons which vary in length because the earth's speed in its orbit round the sun is not uniform.
To compare, in the equal seasons began at 1. When a season has four full moons the third is called the "blue moon" so that the last can continue to be called with the proper name for that season. This gives 11 months with one full moon each and one with two.
This second in a month, so I interpret it, was called Blue Moon. The most literal meaning of blue moon is when the moon not necessarily a full moon appears to a casual observer to be unusually bluish, which is a rare event. The effect can be caused by smoke or dust particles in the atmosphere, as has happened after forest fires in Sweden and Canada in and ,  and after the eruption of Krakatoa in , which caused the moon to appear blue for nearly two years. Helens in and Mount Pinatubo in On September 23, , several muskeg fires that had been smoldering for several years in Alberta, Canada, suddenly blew up into major—and very smoky—fires.
Winds carried the smoke eastward and southward with unusual speed, and the conditions of the fire produced large quantities of oily droplets of just the right size about 1 micrometre in diameter to scatter red and yellow light.
Astronomy Calendar of Celestial Events - Sea and Sky
Wherever the smoke cleared enough so that the sun was visible, it was lavender or blue. Ontario, Canada, and much of the east coast of the United States were affected by the following day, and two days later, observers in Britain reported an indigo sun in smoke-dimmed skies, followed by an equally blue moon that evening.
The key to a blue moon is having lots of particles slightly wider than the wavelength of red light 0. It is rare, but volcanoes sometimes produce such clouds, as do forest fires. Ash and dust clouds thrown into the atmosphere by fires and storms usually contain a mixture of particles with a wide range of sizes, with most smaller than 1 micrometer, and they tend to scatter blue light. This kind of cloud makes the moon turn red; thus red moons are far more common than blue moons. The following blue moons occur between and These dates use UTC as the timezone; exact dates vary with different timezones.
Using the Maine Farmers' Almanac definition of blue moon meaning the third full moon in a season of four full moons, but referenced to astronomical rather than equal seasons , blue moons have occurred or will occur on:. Unlike the astronomical seasonal definition, these dates are dependent on the Gregorian calendar and time zones. Two full moons in one month the second of which is a "blue moon" : .
At that time there will be a total lunar eclipse. There are more modern songs, like Beck 's " Blue Moon. In the paranormal romance fiction novel by Laurell K. Hamilton of the same name, Blue Moon refers to two full moons occurring within the same month.
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The Smurfs TV show also featured the blue moon in an episode. Blue moon is the name of a country in Nintendo's Advance Wars series. There is a move discussion in progress on Wikipedia talk:Disambiguation which affects this page. August, which is ruled by Leo, is the month of the Dog-star, or of Sirius, which thus brings Sirius into close relation to Leo.
He is all about the stage and is the quintessential actor. This may be your son, daughter, godchild, niece, nephew, grandchild or stepchild. Mercury, the planet for communications and media will start its slow down mode and that will influence your family matters. Your Leo Horoscope brings innovation in the area of career and reputation. The Aries October Horoscope, Aries born March 21 to April 19 , including a list of key events for October, a review of Aries personality traits see below , and links to Daily Astrology throughout October Predicting the future using the horoscope is one of the traditional uses of Astrology.
You will prefer to do things as a pair or with a partner than on your own as even simple things contain greater pleasure when you have company and can share. Today, the Sun is in Libra with a Cancer Moon. Horoscopes by Rob Brezsny. Weekly Leo sunsigns horoscope by Astrowow. Read past issues of the newsletter. Leo November Horoscope. Mars will leave Leo for Virgo on August 18th. Read More Free horoscope for Leo: Get some good advice in love and enjoy an happy relationship. Our daily horoscopes are absolutely free and help you to cope up with everyday life.
The first option, the Birth Chart, gives you your natal chart, easy-to-read listings of the positions of the planets and houses in your chart, as well as the aspects between planets and points. Leo Today, you may feel dull.
Go to Cafe Astrology Home. Tomorrow's predictions, Leo for Fri, November 01st, and each zodiac sign. Leo is a faithful partner unless they are criticized. Greetings, Earthlings Leo Health Horoscope Jupiter will be transiting in Scorpio Sign in your 4th house, from January to 30th of March and then from 23rd of April till 4th of November Leo Daily Horoscope: Free Leo horoscopes, love horoscopes, Leo weekly horoscope, monthly zodiac horoscope and daily sign compatibility Read all of today's Leo Horoscope, including the Daily Outlook and Romantic Compatibility You've been moving slowly as the sun's wades through water sign Cancer, but your pace quickens as Mars enters your sign, Leo, on July 1!
Cancer season is a quiet time of year for you, a period of Your horoscope is based on planetary transits to your decan, not to houses, zones or sectors. You might come across your love within your friends. The Sun and Venus forge the most delicious alliance this month, and with Mercury AND Jupiter from the 12th, set to go forwards from retrogrades, a much brighter and more upbeat month can be in store.
In , we will manage to find love more easily, but we will need to look at things with more optimism and detachment. Welcome to September, fiery Leo. You may get stressed over some matter. You will get praised at work because of your talent and intelligence.