[AZ-Observing] Re: magnificent Moonbow, Thursday midnight

>>  Don't be so quick to discount dust, smoke and other pollution from 
>>  affecting what we see. There are other effects at work too, e,g,
>>  diffraction and interference.

     The 22-deg halo that Steve noted arises only from hexagonal ice
crystals.  The local low-level crud is both too small (mainly) and
also irregularly shaped.

\Brian
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