When will the sky turn red?

When the sun goes down in the evening, the clouds on the horizon are often red, like fire. People call this red cloud "flaming red cloud" and "sunset glow". Sometimes, without clouds, the sky will appear fiery red, which is called burning the sky. We already know that the sun is a mixture of red, orange, yellow, green, cyan, blue and purple. Among these colors of light, red light has the greatest ability to pass through the air layer, followed by orange, yellow and green light, and cyan, blue and purple light are the worst. When there are no clouds in the sky, there are few raindrops hanging in the air; At noon, the air layer is very thin, and almost all the red, orange, yellow and green light in the sunlight pass through, only blue, blue and purple light are blocked, and among these lights, blue light reflects the most, so the whole sky is dyed blue. When the sun rises in the east in the morning, or when the sun sets in the evening, the sun shines on the ground, and the air layer it passes through is thicker than when the sun is at the top at noon. The yellow, green, cyan, blue and purple rays in the sun are exhausted after walking in the air layer not far away, and cannot pass through the air layer. Only red and orange light can pass through the air layer and dye the sky red. Burning clouds can predict the weather. The folk proverb "Don't go out early, travel thousands of miles at night" means that if there are burning clouds or burning days in the morning, the weather may get worse; Appear at night, the next day must be a sunny day.

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