Wednesday night’s full moon will be spectacular for a number of reasons. It will appear bigger and brighter. We’ll have clear skies in Southeast Texas. And it has a unique name, Super Blue Moon. But how rare is it?
The earliest occurrence of the moon being called “blue” was after the eruption of Krakatoa in 1883. The volcanic ash was said to have turned the moon blue color. But today, using the term “blue moon” is about the rarity of the event.First, we have to understand definitions. A blue moon is a full moon that occurs twice in one month. As the saying goes, “That happens once in a blue moon,” meaning it’s a rare event. Blue moons occur once every two or three years so they aren’t that rare.
Between 1900 and 2050, the moon has reached full phase close enough to perigee 19 times, or an average of once about every eight years, which, again, isn’t all that rare.It can occur as often as once every five years or have a gap as far as 14 years. The last super blue moon occurred Wednesday, January 1, 2018. The next will occur Saturday, January 1, 2037. Being closer to Earth makes the moon appear 14% larger and 30% bigger. This is more noticeable low on the horizon close to moon rise.
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