Blue Moon

I found your letter in my mailbox today
You were just checking 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 coming on soon.

-- Patrick Alger and Eugene Levine

At 9:04 pm Eastern Daylight Time (USA) tonight, the full moon over North America will turn blue. Well, not literally. And not because it's the second full moon within a calendar month, as popular folklore suggests. An article at SkyTonight.com sheds some light -- moonlight, perhaps -- on the subject.

There are also songs that attempt to do the same...

It was on a moonlight night, the stars were shining bright;
And they whispered from on high, your love had said goodbye.
Blue moon of Kentucky, keep on shining,
Shine on the one that's gone and said goodbye.

-- William Smith "Bill" Monroe
.