Jul 30, 2015 2:52 PM

Joe Knows: First 'Blue Moon' since 2012 to occurs on Friday morning


It’s a BLUE Moon tonight!

Because the time between two full Moons doesn't quite equal a whole month, approximately every three years there are two full Moons in one calendar month. Over the past few decades, the second full Moon has come to be known as a "Blue Moon."

There are even songs written about it. Blue moon of Kentucky is one of my favorites!

The most recent "Blue Moon" occurred in August 2012. Overnight…officially at 5:43 AM Friday, we will have our second full moon of the month…making it “Blue”.

On average, there's a Blue Moon about every 33 months. Blue Moons are rare because the Moon is full every 29 and a half days, so the timing has to be just right to squeeze two full Moons into a calendar month.

The next Blue Moon will happen on January 2018. So they are rare.

The term "Blue Moon" has not always been used this way, however.

While the exact origin of the phrase remains unclear, it does in fact refer to a rare blue coloring of the Moon caused by high-altitude dust particles.

Most sources credit this unusual event, occurring only "once in a blue moon," as the true progenitor of the colorful phrase.

But please do not think the moon will look ‘Blue” tonight. It will not. It will be the same old beautiful white glow illuminating the evening sky this weekend. Enjoy!


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