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The Sun's light is "white" - a mixture of all colors. When the Sun is high in the sky, the light looks "white" - the light isn't colored.

The Earth's atmosphere acts like a prism; the atmosphere bends, or refracts, the Sun's light. You have probably seen similar things on the edge of a crystal, when sunlight is split into a rainbow. When the Sun is on the horizon - actually, just a little BELOW the horizon - the atmosphere refracts the light like a prism, and as the sun sets, we see for a split second all the colors of the rainbow in sequence. One of those colors is green.

You can see the "green flash" if you are looking over a water horizon such as the Pacific Ocean (or, from Florida, the Gulf of Mexico) or from a ship. You can only see it if the western sky is clear, without clouds or fog.

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16y ago

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