Blue Moon
The Blue Moon is a phenomenon whereby the moon appears bluish owing to smoke or dust particles in the atmosphere. It is also the second full moon in a calendar month. There are two definitions of a Blue Moon; both are are type of Full Moon. If the actually looks blue, it's caused by a rare type of dust in the atmosphere. The 2 definitions are:
Seasonal Blue Moon: The Third Full Moon in an astronomical season with four Full Moons (versus the usual three)
Monthly Blue Moon: The second Full Moon in a month with two Full Moons.
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