In the following picture you will see a very interesting phenomena. The plane is above the clouds with the sun behind. You can see a shadow of the plane, but the more significant thing is the perihelia around the shadow. It was the day for that image. I had several opportunities for pics and I took a little film as well. You can see two distinct rings in the pic. The plane has a relatively sharp edge and the diffraction caused by the plane produces a nice series of rainbows projected on the clouds, I think. Very nice.
![](https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEjqZvvSJXo0D06UtfqQIHt-6difon-WNakhFns2xOcSs0lKCERlfwkLUcphgJSmpVMnpPgFo8bPJMHZStMjSenV9bPfcOs7VF5vm5wp2F8SC_ogJVYzI4e7YsVkvdkL7ge0ouZm/s320/IMG_1311+smaller.jpg)
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