.... I wrote something up about 'blue moons' and its changed meaning over
the years here ....

http://weatherfaqs.org.uk/node/161

As with so many other facets of life, the US-dominated media -
entertainment - commercial environment has altered its original meaning
which is a shame because the 'true' blue moon is a fascinating
phenomenon; this changed / altered usage is similar to the (now) common
use of the phrase 'Indian Summer' which no doubt we'll also hear a lot
of in the weeks to come.


Martin.




--
West Moors / East Dorset
Lat: 50deg 49.25'N, Long: 01deg 53.05'W
Height (amsl): 17 m (56 feet)
COL category: C1 overall