![]() Still, it happens about every two to three years.īut is the moon really blue? No. It doesn’t happen every month because full moons generally occur 29.5 days apart. Calling the third moon a Blue Moon instead helps keep the dates of Easter in a more comfortable range.Īnother popular definition describes a Blue Moon as the second full moon, when two full moons appear in one calendar month. Throw in an extra moon and holiday planning can get wacky. Easter is traditionally celebrated on the first Sunday after the Paschal or Easter full moon, which is the first full moon on or after March 21 (an approximation of the spring equinox). The Christian ecclesiastical calendar uses the phases of the moon to determine the date of Easter. It might not sound important, but it’s the reason you always hear people say, “When’s Easter this year?” What’s a Blue Moon? Without getting too technical (astronomy gets complicated fast) a seasonal Blue Moon is the third full moon in an astronomical season with four full moons. We have to harken back to 1944 for the last time all continental US time zones were treated to the light of a Halloween Blue Moon So, some areas of the US haven’t had a Halloween Blue Moon since 1955. Even then, it only happened in the Central, Mountain, and Pacific time zones. If you’re under 18, you’ve never seen a Blue Moon on Halloween, as the last time the phenomenon occurred was in 2001. The world might be conspiring against kids to take the fun out of Halloween this year, but the stars have a trick of their own - a Blue Moon on Halloween.
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