[NatureNS] rainbow at night?

References: <1084.24.215.115.47.1208563976.squirrel@webmail.seaside.ns.ca> <4809FFBB.30204@glinx.com> <000f01c8a26b$b47a8d70$a7478a18@oldcoot3>
From: Patrick Kelly <patrick.kelly@dal.ca>
Date: Mon, 21 Apr 2008 16:11:57 -0300
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Hi all:

 From p.189 of the 2008 RASC Handbook (section written by Roy Bishop):

====
Rainbows at night:
Observations of lunar rainbows are rare. The Moon is bright enough to  
produce a noticeable rainbow only when it is near its full phase. Also,  
people are usually indoors at night, and when they do step outside it  
is often into a light-polluted environment, which rules out any chance  
of seeing a lunar rainbow. Even when conditions are favourable, few  
people would notice a lunar rainbow because it is too dim to activate  
colour vision and therefore appears white.
====

Note, that like the Sun, to see a rainbow at night you would have to  
have your back to the Moon, and a line connecting the Moon and your  
head would point to the centre of the bow.

Pat



On Apr 19, 2008, at 7:21 PM, Margaret E.Millard wrote:

> out here along the shore often when there is a moon shining through  
> either wispy low cloud or fog/mist there is quite often a moray or  
> rainbow sometimes more clearly visible than others. I find my glasses,  
> they have the sun protection built in,  adds to it.
> Marg Millard, White Point, Queens
> http://margmillard.ca
> ----- Original Message ----- From: "David & Alison Webster"  
> <dwebster@glinx.com>
> To: <naturens@chebucto.ns.ca>
> Sent: Saturday, April 19, 2008 11:20 AM
> Subject: Re: [NatureNS] rainbow at night?
>
>
>> Northern Lights ?
>> DW
>>
>> bdigout@seaside.ns.ca wrote:
>>
>>> As we arrived home this evening  in Samsonville at 9:00 P.M. there  
>>> was a
>>> light arc in the nnw, going from the horizon up about 20 degrees and  
>>> back
>>> to the horizon.  There was a light mist at the time, but also a full  
>>> moon.
>>> Does anybody have an idea what it might be?
>>> Billy
>>>
>>
>
>

======================================================================== 
==
Patrick Kelly
Director of Computer Facilities
======================================================================== 
==
Faculty of Architecture and Planning
Dalhousie University
======================================================================== 
==
PO Box 1000 Stn Central                5410 Spring Garden Road
Halifax, Nova Scotia B3J 2X4           Halifax, Nova Scotia B3J 2X4
Canada                                 Canada
======================================================================== 
==
Phone:(902) 494-3294    FAX:(902) 423-6672   E-mail:patrick.kelly@dal.ca
======================================================================== 
==


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Hi all:


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