Hello Fellow Shadowphiles,
Message text written by "Les Cowley"
>The circumzenithal arc can occur when the altitude of the sun is less
than 32.2 deg. It is best seen when the sun's altitude is around 20-25
degrees.
It is a partial circle centered on the zenith.
<
Thanks for the info, Les - I'll bet you are right...
I got the 18-26 degree data from the Audubon Field Guide.
About it being a partial arc - I've got some anecdotal evidence
that it may be mroe than a partial arc -
20 years ago a woman I know told me about seeing a beautiful
bright rainbow that was a *complete* circle and it was centered
overhead.
I've also seen many paintings (mostly in Indian artwork) that
renders a complete circle of bright colors in the air.
Les, What are the chances it could be complete, albeit rare?
I've checked out the 'Halo' program that Les refers to in his e-mail.
What a *wonderful* program! I'm not often impressed by software.
This one impresses me.
Les is one of the authors of it. *Great job, Les!*
*** Be sure to check it out *** it's at
Atmospheric Halos on the web at:
http://dspace.dial.pipex.com/lc/halo/halosim.htm
Anybody have any unusual furniture items?
Chuck O'Connell
