![]() ![]() That depends on which definition for a Blue Moon you care to use. Joe Rao is 's skywatching columnist, as well as a veteran meteorologist and eclipse chaser who also serves as an instructor and guest lecturer at New York's Hayden Planetarium. We asked meteorologist Joe Rao, a few commonly asked questions about the Blue Moon. Helens in 1980 and Mount Pinatubo in 1991. The tiny ash particles - about one micron in size - acted as a filter, scattering red light and turning the moon a distinct blue-green hue.Īccording to NASA Science, other volcanic eruptions have also been known to cause blue moons including the 1983 eruption of El Chichon volcano in Mexico and the eruptions of Mt. Yes! But this is an extremely rare event, you could even say it happens "once in a Blue Moon".Īccording to NASA in 1883 an Indonesian volcano called Krakatoa erupted and spread ash as high as 50 miles (80 kilometers) into the atmosphere. If you're interested in trying to capture an impressive lunar image yourself and want to learn the right techniques and tools, check out our handy how to photograph the moon guide. The next seasonal Blue Moon will take place on Aug. ![]() ![]() (Image credit: Andrew Bret Wallis via Getty Images) Blue Moons occur once every two to three years. ![]()
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