Circular Rainbow Viewed from the Tower of Viterbo Airport, Italy

May 06, 2021


Photographer: Marco Meniero 

Summary Authors: Marco Meniero; Jim Foster

Shown above is a nearly complete rainbow as observed from the top of the control tower at Viterbo Airport, Italy. It was captured using a fisheye lens on December 7, 2020. When viewed from aloft, it can be seen that rainbows are circular structures, as first described by Renes Descartes almost 400 years ago. The shadow of the camera is at the center of the rainbow circle, facing the antisolar point. Note also the faint secondary bow.