Blue Moon :
the REAL Story
B U L L E T I N !
Breaking News! This just in to the DANCING TRAIL News Center: Here is the latest on the Real Blue Moon story! The magazine,
Sky & Telescope, has just had their, probably, first ever exposé in the May issue of 1999. It turns out that the Real Blue Moon may not necessarily be the second full moon when two full moons occur in one month!
Now, what follows in this bulletin contains graphic material and may not be suitable for all ages; please use suitable discretion:
It turns out that the length of time from full moon to full moon is 29.5 days, and since the solar year has 365.25 days, then each year contains enough days for 12 full moons plus 11 days left over, so therefore, 7 years out of every 19 there will actually be 13 full moons. Also, the Astronomical Calendar Year, called a "tropical year", does not run from January 1 to December 31, but from "Yule" ( December 21, or winter solstice) to "Yule"; this places three full moons in each season except for those 7/19 years (told you it would get graphic) which will contain one season which will have four full moons. - and therein lies the scientific part of the problem.
The real problem, however, is religious, and that mix-match goes something like this: The Roman Catholic Church has decided that the vernal equinox will
always fall on March 21, regardless of whether the sun actually crosses the equator on that day or not (people more familiar with the Roman Catholic Church than I am usually just close their eyes and nod their head when we get to this part), and also that Easter
must fall within one week after the Paschal Moon which, the church says, is that first full moon after March 21. So, all the moons of the year are determined by the "tropical" year (yule-yule rule) except for the two near Easter, the Paschal Moon (the first full moon of spring) and the one before it, called (by the Church) the Lenten Moon, (the last full moon of winter) which are determined by ecclesiastical rules. And, in order to keep the other main moons still corresponding to the activity suitable to them (harvest, mid-summer, long-night) whenever a season, as measured from Yule to Yule has four full moons in it, the third (not the fourth) full moon is designated as the Blue Moon. So, now you know.
The Jewish faith handles this problem by adding to seven out of every nineteen years, basically a "blue month", which they call Adar. The Islamic faith, not being especially concerned with Passover, Easter or Christmas, ignores the whole thing, letting their calendar years rotate backwards so any given month begins 11 days earlier each year. So, if you want to refer to a really, really, really long time, you might try the term "Islamic Blue Moon"!
Sky & Telescope apologies for their "error", committed 53 years ago in the March, 1946 issue, and suggests that both methods be retained, since "theirs" is certainly much simpler!
How does all this affect our current Blue Moon status? Hmmm. That would mean no Blue Moons at all in 1999! Next one would be February 19, 2000. February, of course is the only month which could never have a Blue Moon under the second full moon in a month rule, but under the four in a season rule, one out of every four blue moons MUST occur in February! The others will have to be in May, August, & November.
The official DANCING TRAIL policy toward this new development will be to try to celebrate all Blue Moons, whether "tropical" or "ecclesiastical". And perhaps we might call the now unauthorized, two in a month occurrence a "Risqué Moon", and the new, but really older, four in a season occurrence an "Out-of-the-Blue Moon".
Attended Gail's beer- and wine-tasting last night. Beer provided by Natty Green's of Greensboro, NC. I enjoyed their "Black Powder" and "Red Nose". My wife liked the Golden Amber and brought some home. We also got Duplin's Christmas Wine. I love Duplin's summer wines and have wished they made some cool weather wine. 
