AUG 2021
A rare seasonal "Blue Moon" wowed skywatchers Sunday (Aug. 22), marking the last time this type of moon will grace the sky until 2023.
The full moon, also known as the "Sturgeon Moon," was not called blue for its color. Rather, it has to do with a scheduling rule that happens during a calendar year with 13 full moons, instead of the usual 12.
If four full moons fall during one season, that's called a Blue Moon. A newer definition also defines a Blue Moon as the second full moon in a month, but that definition did not apply to Sunday's sky show.
Regardless of its name, the moon wowed skywatchers on multiple continents, as an informal survey of Twitter shows below.
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