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The most literal meaning of blue moon is when the moon (not necessarily a full moon) appears to a casual observer to be unusually bluish, which is a rare event. The effect can be caused by smoke or dust particles in the atmosphere, as has happened after forest fires in Sweden and Canada in 1950 and 1951.
The key to a blue moon is having lots of particles slightly wider than the wavelength of red light (0.7 micrometre)--and no other sizes present. This is rare, but volcanoes sometimes produce such clouds, as do forest fires. Ash and dust clouds thrown into the atmosphere by fires and storms usually contain a mixture of particles with a wide range of sizes, with most smaller than 1 micrometre, and they tend to scatter blue light. This kind of cloud makes the moon turn red; thus red moons are far more common than blue moons.
Originally posted by TheLoony
Huh. Now I don't know what to think.
The other night, I think two nights ago, I was a cruising home and I took a gander at the moon. I did a double take as I noticed a small bit of blue around the edge. I thought it was due to my slowly fading eyesight. Maybe not.
Not something I had ever noticed before, but there is the possibility I was just seeing things.