On Sat, 10 Jul 2010 11:22:15 -0700 (PDT)
" wrote:

Just taken these http://picasaweb.google.co.uk/nickw7...InverseRainbow
photos.

As you can see it's not raining, but I think it's like a Sun Dog...

I've only seen this in strong association with Sundogs, it's a
"Circumzenithal Arc".

http://www.atoptics.co.uk/halo/cza.htm


However the "zenith" in its name is not the astronomical zenith, its
some sort of artificial point, which led me to looking in the wrong
place for many decades.

Now I know where to look, the CZA can be seen several times every year.


BTW, a bit late now, there has been some Noctilucent Cloud about this
evening, first decent sighting this year for me.



Mike
--
Mike Causer