Once In A Very Blue Moon

A Full Moon

Coming Soon

On tomorrow night August 31st a blue moon will occur. No the moon does not turn blue, for this common pair of words is used to describe the uncommon occurrence . And that unusual event is when a full moon occurs twice in the same month. Since a complete lunar cycle takes 29.5 days and every month except February has 30 or more days, a blue moon can occur during eleven of the twelve months. According to NASA, a blue moon occurs on the average about every 2.5 years.

When The Moon Appears Blue

Normally the moon does not appear blue, when it is full. In fact, a twice-a-month ‘blue moon’ has the same color as any other full moon. However, atmospheric effects, like the presence of volcanic ash, smoke from forest fires or ice particles in the sky, can give a full moon a bluish tint. Documented cases of the moon taking on a blueish color are presented at the space weather website.

Optical Illusion

Some blue moons may be all in your head – or at least in the retina of your eyes. This might happen when a person moves quickly from an indoor location, illuminated by an oil lamp to an outdoor site, where the full moon hangs high in the sky. This quick change of scenery can cause the moon to appear blue for a short period of time. Not surprisingly, this phenomena has more to do with the nature of human vision  than any celestial event that occurs in the night sky.

Nanci Griffith
Nanci Griffith is a popular singer who crosses folk with country, photo by Jem1234, from Wikipedia

Popular Slang

Over the years a saying, ‘once in a blue moon’ has developed. More a musical-poetic interpretation of the phrase you might what to check out this song that is performed by Nanci Griffith, entitled Once In A Very Blue Moon. It is a woman’s lament about events in life that only occur on rare intervals. And if you are into lyrics here a is the opening verse and chorus. By the way these words were written by Patrick Alger & Gene Levine.

I found your letter in my mailbox today
You were just checkin’ if I was okay
And if I miss you, well, you know what they say…

Just once… in a very blue moon
Just once in a very blue moon
Just once… in a very blue moon
And I feel one comin’ on soon

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