It turns out a blue moon is when two full moons occur in the same month.
And it is not as rare as you might think.
It occurs every 28 to 30 months.
The next blue moon will occur on January 31, 2018.
Forget about all the plans you’re making between now and then.
Instead, make a commitment: A quantum leap just might occur once in a blue moon.
Josh Allred's Blog 