The year 2020 has been full of surprises, and here’s another: a blue moon will be appearing in the night sky on Halloween! What’s a blue moon? Well, full moons usually rise once a month, but October 2020 will grace us with two. Normally, we only see two full moons in a single month once every three years or so. A full moon on Halloween night? Well, that only happens once every 18-19 years.
Will it actually be blue? No, it will still be the pale grey and white that we’re used to seeing, but it did indeed have a lovely blue tint in 1883 when the volcano Krakatoa erupted and filled the atmosphere with dust and smoke.
So enjoy the particularly spooky sky this Halloween night. It only happens “once in a blue moon!” And yes, this rare event did lead to the coining of this popular phrase, all the way back in 1821.
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