On Friday 31st of August 2012 there will be a Full Blue Moon. So
you may be wondering why that particular Full Moon is called a
Blue Moon. According to modern folklore: The Blue Moon is the
2nd Full Moon in a calendar month. Usually a month has only one
Full Moon. Full Moons are separated by 29 days while most months
have 30 or 31 days so it's possible to have 2 Full Moons in one
month. The only month which can't have 2 Full Moons is February.
According to seasonal folklore: Each season contains 3 months
and each month has a Full Moon. There are 3 Full Moons for
Winter, 3 Full Moons for Spring, 3 Full Moons for Summer, and 3
Full Moons for Fall. All these seasonal moons add up to 12. But
occasionally one season has 4 Full Moons instead of 3. The 4th
Seasonal Full Moon is the Blue Moon. Astronomical there's
nothing really special about a Full Blue Moon. The Full Blue
Moons happen on average once every 2.7 years. There have been
instances in the historical past that the Full Moon was really
colored blue. On 26