Hello Miles.

09 Aug 04 05:11, you wrote to Herman Trivilino:

 MM> G'morning Herman,

 HT>> Not the reason why.  Blue moons ARE blue.  They have
 HT>> nothing to do with the number of full moons in a calendar
 HT>> month.  The moon (full or otherwise) appears blue due to
 HT>> atmospheric scattering.  The longer wavelengths are
 HT>> scattered by particles (e.g. particles of smoke) leaving
 HT>> the shorter (i.e. blue) wavelengths.

 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.

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

Jasen

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