When the sun goes down, it is crimson. This shows that the atmosphere contains more water vapor and impurities, so blue light is completely scattered by the atmosphere, leaving only red light with the longest wavelength, so the color of the sun we see is carmine.
Because the atmosphere already contains more impurities such as water vapor and dust, it is generally easier to cause rainfall. If there are no other conditions (such as system influence, mountain action, thermal convection, etc.). ), not enough to form a precipitate.
Therefore, "sunset red" can only say that it is more likely to rain in the future, and it is necessary to refer to whether other conditions are met. If it happens, it may be said that the weather will turn to rain, otherwise it is impossible to have the phenomenon of "no rain and no wind".
Extended data
Proverbs are concise phrases widely circulated among the people, mostly short sentences or rhymes that are easy to understand in spoken form.
Proverbs describing weather changes include:
1, the stars are shining at night, and the sun is still shining in the Ming Dynasty. Look at the bright stars tonight. I think it will be sunny tomorrow.
The dew is heavy tonight and the sun is red tomorrow. It means that there is much dew at night and the sun will be red tomorrow.
3. A rainy mountain wears a hat, but a rainy mountain has no waist. It means that when it rains, there are clouds on the mountain; When there is no rain, clouds cover the mountainside.
4, long sunny and foggy perineum, long rain and fog will be fine. It means that the fog will be cloudy after a long sunny day, and it will be clear after many days of rain.
The dew is heavy tonight and the sun is red tomorrow. It means there is a lot of dew at night, and the sun must be red tomorrow.