Why do you say that the sun doesn't go out and the sunset goes to Wan Li Road?

There is only one proverb, "The morning glow never goes out, and the sunset glow goes thousands of miles"; This is a summary of people's experience in observing the relationship between meteorology and weather for many years. Now research shows that when the water vapor content in the atmosphere is high, it is easy to appear "morning glow" in the morning sun, and the high water vapor content in the air is the condition of precipitation. Therefore, when the "morning glow" is observed, it indicates that it will rain, which is not good for people who go out for a long trip. The appearance of sunset glow indicates sunny weather, which is naturally suitable for long-distance travel.