David asked:
> My wife noticed something odd.  The nearly-full moon was about 30
> degrees above the horizon.  There was a notable glow on the horizon,
> except under the moon.  The moon seemed to be in a column of darkness
> that was about three times the apparent width of the moon.  We could see
> the column over its entire length as a strip of sky darker than the sky
> around it.
>
> Any of you ever see this?  Do you have any idea what could have caused
> it?  I suspect it's due to some pecularity of the visual system, but
> have no clear idea.
I'm surprised to not find this phenomenon in Corlis. I could have sworn I
saw it there. He does have the somewhat similar dark sky between a rainbow
and a secondary bow. I personally have seen a rainbow enclosing a
semi-circle of darker sky.
I know I've read about pillars under the Sun and Moon elsewhere, but I can't
recall if they were reportedly dark or bright. I do know these sorts of
things are supposed to be quirks of optics not of the visual system. I'm
sorry I haven't got any answers, but a search through some books on
atmospheric optics ought to turn a few hints up.
Bill
William Jacobs
Freelance Unemployed Person
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