G'morning Jasen, 

 MM> Err ... my OED sees `blue moon' as `very rare',  and fitting a
 MM> lunar cycle inside a calendar month is indeed a rare event...
 MM> justifying the common usage of the term, one would think.

 JB> it happens about once every year. - 13 lunar cycles into 12 calendar
 JB> months...

Mmmm ... I haven't tried to verify it, but the local paper claimed 
t'other day that Auckland's previous Blue Moon was in September, 
2002;  I wonder if there are any `records' associated with this - 
shortest, longest or `year with most' ?

:-))
 
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