The green ray at sunset
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Photo from Italy by @giuseppebaldassarri
The phenomenon is due to the refraction of sunlight by the atmosphere, when the grazing solar rays, crossing a thicker layer of air, are broken down as in a prism into the various colored components, and among these the green one is distinguished by contrast with the general yellow-orange hue of the sky.
In detail, the color of the ray is Veronese green, named in honor of the painter who discovered the pigment, Paolo Veronese.
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