May 07-02

Past-E-Mail: Cam Notes - 2002: May: May 07-02
Rainbow in Watersmeet    ...scroll down to share comments
Photo by Bob Wenberg
Near JCT US-2 and US-45    ...scroll down to share comments
Photo by Bob Wenberg

Charlie at Pasty Central on Tuesday, May 7, 2002 - 06:59 am:

Some quick work by Bob Wenberg to catch both ends... In the second shot, it looks like the rainbow is beginning to dissolve and shower its Lucky Charms all over this quiet crossroads village.

Thanks for all the shots we are receiving at the new email address for

By Don, Wisconsin on Tuesday, May 7, 2002 - 08:17 am:

Thanks for the preview. We'll be driving through next week to a Northwoods Historical Consortium meeting in Rockland.

By MarkM_in_Chicago on Tuesday, May 7, 2002 - 10:24 am:

I believe it is scientific fact that all rainbows are double-rainbows, but conditions need to be just right to see the second one. Seems that a particular overseer has made sure "God's Country" always has the right conditions. If you look at the American flag you will notice the faint arc of the second rainbow rising into the sky. It's also evident in the second photo, but a little harder to see.

Charlie, thanks for the addition of the maps. I sent you a message a few months back about adding them to help orientate people who haven't visited the U.P. (and for us past residents with progressively blurring memory). I believe has sent in a map or two recently to enhance the Cam Notes and I have sent them thanks for that. Maybe there is an opportunity here to couple Guest PastyCam Photographers with Guest PastyCam Mappers? Hmm.

By Ladyyoop on Tuesday, May 7, 2002 - 06:19 pm:

Are the Wenbergs taking over the Papparazzi jobs?
Great jobs with the pics ya'll~!~!

By Pat in Memphis on Tuesday, May 7, 2002 - 07:21 pm:

Ah yes MarkM in Chicago...And what a shot of "Alexander's Dark Band", which is always darkest between the two rainbows, so even though the second is very faint, you can tell where it is. There is "Fun Physics" here, but it is sort of a brain burner (still interesting even if we can't understand it all). Bob Wenberg just gave us a great shot, thanks

By Alice, Ventura, CA on Wednesday, May 8, 2002 - 12:54 am:

Again, I am just tickled to learn so many scientific and historical facts on this site. I appreciate that so many people share their knowledge on such a variety of things here. Any day you learn something is a very special day.

By Me on Wednesday, May 8, 2002 - 05:07 am:

From the World Wide Web:
A few things to look out for when next you see a rainbow:

As the centre of a rainbow is the antisolar point, it is an arc scribed around the shadow or your head. Since the radius of a rainbow is 42 degrees, it will never be visible if the sun is more than 42 degrees above the horizon.

Look out for a rainbow when there is a spectacular red sunset -- the rainbow reveals the spectrum of the present illumination, so it will be predominantly red too.

The explanation for the formation of rainbows was first provided by Descartes.

Look for the secondary rainbow, with a radius of about 51 degrees. It is much fainter, and the colours are reversed.

Look for the supernumary bow of alternating green and pink on the inner edge of the main bow. This is caused by diffraction within the raindrop, rather than refraction, the cause of the main bow, and is therefore very sensitive to raindrop size. The supernumary bow will be best with the largest drop size (1-2mm), and will become more yellow and vanish altogether as droplet size reduces to around 0.1mm. At less then 0.05mm drop diameter, all colour vanishes from the bow, resulting in a white 'mist-bow'.

The sky between the two rainbows, and the surrounding sky is darker than normal since the light has been 'diverted' into the bow itself. The dark band between to two bows is called 'Alexander's Dark Band' (as opposed to his ragtime one).

The light from the rainbow is polarised. Try looking at one through a polarising filter or polaroid sunglasses; part of it will be missing, and the missing part will move as you rotate the filter.

There is, of course, an infra-red component to the rainbow. You could try photographing it with infra-red film.

Each of your eyes sees a separate rainbow, since it is looking from a slightly different viewpoint. Try making your own rainbow with a garden hose, and then shut each eye alternately, to see it move.

By the Ghoul on Tuesday, July 2, 2002 - 10:14 am:

Those are some cool photos!

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