Mountain Shadow
Imaged by Claudia Hinz (Atmospheric Phenomena) from the 1848m high Wendelstein Observatory in the Bavarian Alps, Germany. The morning shadow of Wendelstein falls over the Leitzach Valley.
 ©Claudia Hinz, shown with permission

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The shadow is a very long column of unlit air. It only looks triangular because we see the shadow tube sides receding away into the distance almost to a point directly opposite the sun.

Shadows and rays are one of the few atmospheric optics effects that are real in the sense that we can walk or fly around them.