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Blue moon means the second full moon in a month.
This do not always happens, so it is something special.
This blue moon is something very very special because it happens on the last day of a year.
The last blue moon on the 31st December happened in 1990.
It happened 19 years ago.
At that time I was not born yet.
Anyway the moon is not blue in colour on the night of blue moon 🙂