->  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' ? 
  
I wonder if they insist that the moon must be above the horizon, as 
seen from the relevant place, at the exact moment of "fullness" in 
order to count in the calculation. That would somewhat reduce the 
frequency. 
  
I read someplace not long ago that this "second full moon in a month"  
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