Once In a Blue Moon ... or every couple of years

I was in New York for a quick visit last week.  

Seems I get there often recently.

A little more rare, I got a chance to see a concert (U2 at Madison Square Garden) and eat Junior's Cheesecake.

Meanwhile, Friday marked the second full moon of July, a phenomenon referred to as a “Blue Moon.”

  

150730 Blue Moon

  

Though the phrase “once in a blue moon” is used to describe a rare event … a blue moon is not really that rare; nor does imply that the moon appears blue.

Technically, the term “blue moon” describes the second full moon in a single calendar month.

Most years only have 12 moons, but this year has 13 (which happens every two to three years).

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