2007-02-25 13:12:55 · 5 answers · asked by ono 2 in Science & Mathematics ➔ Astronomy & Space
Once in a Blue Moon ... is a common way of saying not very often, but what exactly is a Blue Moon?
According to the popular definition, it is the second Full Moon to occur in a single calendar month.
The average interval between Full Moons is about 29.5 days, whilst the length of an average month is roughly 30.5 days. This makes it very unlikely that any given month will contain two Full Moons, though it does sometimes happen.
On average, there will be 41 months that have two Full Moons in every century, so you could say that once in a Blue Moon actually means once every two-and-a-half years.
July 31, 2004 was our last one, and our next one is May 31, 2007.
2007-02-25 14:59:31 · answer #1 · answered by drewbear_99 5 · 0⤊ 0⤋
A "Blue Moon" is, as the previous answer noted, the second full moon in the month. But it doesn't happen every month, so when it does, it is called a Blue Moon.
2007-02-25 13:55:32 · answer #2 · answered by kedder 2 · 0⤊ 0⤋
just that and there are not many of them so it can be a long time between blue moons.
Look up blue moon and see how it became to be.
2007-02-25 14:04:36 · answer #3 · answered by Anonymous · 0⤊ 0⤋
It means "not very often".
A blue moon is the second full moon in a month.
2007-02-25 13:16:48 · answer #4 · answered by anonimous 6 · 0⤊ 0⤋
VERY VERY SELDOM!
2007-02-25 13:21:03 · answer #5 · answered by DARRELL L 1 · 0⤊ 0⤋