No, it's not the first of April. The phenomenon known as a 'fire rainbow' does exist. A fire rainbow is a halo or an optical phenomenon similar in appearance to a horizontal rainbow, but in contrast caused by the refraction of light through the ice crystals in cirrus clouds.
Here, read the science behind it and marvel at some amazing photography of this rare beauty, the circumhorizont arc, known to its friends as a CHA.
(via Robert-John)
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