![]() Current lunation cycle is highlighted yellow. Dates are based on the Gregorian calendar. Time is adjusted for DST when applicable. Business Date to Date (exclude holidays).If you go by the "Pruett two full moons in a month rule," the next blue moon will also come in the month of August - Aug. So, when are the next Blue Moons after this Sunday? Consider this column an updated version for 2021. And as it turns out, the last time we had a blue moon based on the "four full moons in a season" rule was in May 2019. Chandrayaan-3 Live Updates: If Isro pulls this mission off successfully, India will join an exclusive list of just three other countries that have managed a soft landing on the Moonthe United States, the erstwhile Soviet Union and most recently, China. Here at, we have posted many stories regarding the differences between the two blue moon definitions over the years. But nothing out of the ordinary has occurred in recent days or weeks, so this weekend's moon should look pretty much the way we are accustomed to seeing it. August 2021 (Dark Moon having been on 8 August) just a couple of minutes before disappearing. The Republican calendar later used by Rome followed Greek calendars in its assumptions of 29.5 days in a lunar cycle and 12.5 synodic months in a solar year. In the past, there have been very unusual atmospheric circumstances that have caused the moon (and the sun) to appear bluish, caused by anthropogenic aerosols injected into the atmosphere such as volcanic ash and dust (after the eruption of the Krakatoa volcano in August 1883) or airborne soot from forest fires (such as from western Canada in September 1950). This then, the Setting Waxing Crescent Moon of 11. Of course, to everyone who sees it, it will still look full, even though it will be ever-so-slightly out of perfect roundness.Īnd don't expect to see the moon shine with a bluish tint. That means that for North America, the moon phase will be just past full - actually a waning gibbous moon - when it comes over the horizon at nightfall that Sunday evening. Check here all the moon phases of every month of 2021 in the United Kingdom. The third full moon - the Blue Moon according to the original rule set down by the Maine Farmers' Almanac - comes on Sunday, with the moon officially turning full at 8:02 a.m. Moon Calendar 2021 with all the moon phases of the year. So, going by the old "Maine Almanac rule," for summer 2021, we have four full moons: June 24, July 23, Aug. You should not confuse it with The Farmers' Almanac which has been publishing continuously since 1818, but coincidentally also happens to be based in Lewiston, Maine. There is also a detailed description of the lunar phase for the chosen day of the month. ![]() You can easily navigate each day of the month by clicking the icons below. The month of August 2021 begins with a Last Quarter phase that is illuminated to 35.01. Meanwhile, the "original" Maine Farmers' Almanac rule had been all but forgotten.Īs was noted earlier, that publication has long since gone out of business. You can see that for every day of August 2021, there will be a different moon phase displayed. Pruett's misinterpretation gained traction with a new audience of baby boomers, and today his "two full moons in a month rule" is recognized worldwide. Pruett's 1946 explanation was, of course, the wrong interpretation and it might have been completely forgotten were it not for journalist Deborah Byrd, who used it on her popular National Public Radio program, StarDate on Jan. This second in a month, so I interpret it, was called Blue Moon." This gives 11 months with one full moon each and one with two. "Seven times in 19 years there were - and still are - 13 full moons in a year. ![]() Pruett unfortunately came to this conclusion: ![]() ![]() This time, on page 3 of the March 1946 issue, James Hugh Pruett wrote an article, " Once in a Blue Moon," in which he made a reference to the term "Blue Moon" and the S&T article from July 1943. Once again, we must turn to the pages of Sky & Telescope. ![]()
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