Second photo of a third-order (tertiary) rainbow (left), and first photo of a fourth-order (quaternary) rainbow (right). The first two rainbows aren’t included in the image. These rainbows appear on the sunward side of the sky, at approximately 40° and 45°, respectively, from the sun. Michael Theusner took this image on June 11, 2011 in Schiffdorf, Germany. Credit: Michael Theusner/Applied Optics.

October 6, 2011

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