In case you are not already aware, there will be a Blue Moon on New Years Eve this year.
Also, another bit of trivia: blue moons are not actually blue in color; rather, they are the color of every other moon. A blue moon is, in fact, the second full moon in a calendar month (in this case, tonight's sky will feature the first full moon of the month).
This double mooning only happens every 2.5 years or so, hence the expression "once in a blue moon."
Om shanti, my dearies.