National Geographic via National Geographic Magazine A rare optical phenomenon called a circumhorizontal arc illuminates the Nuptse summit of the Himalayas. Explore more stunning images by our photo community on the #YourShot Blog.
(PHOTO: AL) 18 weird natural phenomena around the world: Circumhorizontal Arc (Fire Rainbow) A circumhorizontal arc or fire rainbow is a rare optical phenomenon - an ice-halo formed by plate-shaped ice crystals in high-level cirrus clouds. They can be seen best when the sun is very high in the sky - higher than 58°. Apparently, you have to be at a very precise location and latitude so see one.