Once in a Blue Moon

Once in a Blue MoonSo, you’ve probably heard the phrase “once in a blue moon” for something that’s very rare. But where the heck does that phrase come from? And why is the Blue Moon such a big deal in lycanthrope mythology?

Today’s idea of the Blue Moon

Today, the blue moon has come to represent the second full moon in a month. For those of you who are a little more science-y, the lunar cycle is 29.5 days. So, if the full moon falls in the first couple days of the month, there very well might be a second one at the end of the month. It doesn’t happen often, and not at all in the years of 2011, 2014, and 2017. You have two blue moons a year about every 19 years, with the last one in 1999. So, now you know.

The Folklore of the Blue Moon

Maine Farmers’ Almanac listed blue moon dates for farmers, and was usually listed about the third full moon of a quarter with four full moons. It’s pretty confusing, but it was ultimately attributed to a seasonal thing. It works kind of like the equinox, which follows the seasons not the year.

Werewolf Implications

So, if you’re a lycanthrope forced to shift at the full moon, then knowing about blue moons might be pretty important! Keeping track of full moons and blue moons and even the dark of the moon become more vital.

The Cliche

Don’t fall into the cliche of the blue moon in your stories. If you want to use it, feel free. But naming your werewolf bar “The Blue Moon” has been done. A lot. So, keep that in mind when naming things. If you want cliche, then you’ve got it made. If not …


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