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From: "John Kahila" <jkahila@world.std.com>
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Date: Tue, 27 Aug 2002 23:57:42 -0400
Subject: RE: [zzzzteana] Moon over ocean
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>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.

Bill Jacobs:
> 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.

Some links:

comprehensive
http://www.meteoros.de/indexe.htm

Atmospheric Light Phenomena
http://www.auf.asn.au/meteorology/section12.html

interesting observational stuff from the prior millenium including pix
(click 1997 / colour plates)
http://www.ursa.fi/ursa/jaostot/halot/ehp/index.html

more pix, many of which flip to negative to highlight details (hover cursor)
http://idefix.taide.turkuamk.fi/~iluukkon/taivas/valok/88.html and
subsequent links

john k


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