On 23/11/10 16:33, Anne Burgess wrote:
I'd prefer mainly clear skies with a touch of high cloud --
because
this winter's project is looking for a lunar CZA.
Mike
Er .... what a CZA, pardon my higgerance?

Circumzenithal arc. See the top of the following picture.
http://www.spaceweather.com/swpod2010/31oct10/Sauli-Koski_key.jpg?PHPSESSID=n25erbnr2v3r4rsaejd2fk9vm3

Also this site is worth a peek. http://www.atoptics.co.uk/ Have a
look at "Ice Halos"

--
Graham Davis, Bracknell, Berks.
E-mail: "newsman", not "newsboy"
Another Brick in The Wall: http://www.youtube.com/watch?v=OIP38eq-ywc