Look at the clouds and know what the weather means: "Don't go out at sunrise, Wan Li Road at sunset".

"The morning sun rises in the east, and the sunset glow in Wan Li Road" means that if there is too much water vapor in the atmosphere, some short-wavelength blue light, blue light and purple light in the sun will be scattered by the atmosphere, and only red light, orange light and yellow light will penetrate the atmosphere, dyeing the sky red and orange and blooming into the morning light. The appearance of Xia Hong means that the clouds and rain in the west will move, so "the morning glow never dies" and you see the sunset glow at night, which means that the clouds and rain have moved to the east and the weather will clear up, so "the sunset glow goes to Wan Li Road."

Scientific basis:

In the morning or evening, the sun shines obliquely, and the distance through the air layer is relatively long, and the scattering is greatly weakened. In the solar light wave, purple is the most weakened, followed by indigo and blue, and red or orange light is the least weakened. These weakened colored sunlight shines on the sky and clouds, forming bright and dazzling rosy clouds.

In the morning of spring and summer, the low-altitude air is stable and there is little dust. If there is a bright morning glow, it means that there are many water drops and clouds in the eastern low altitude, and the bad weather will gradually approach. This is the reason why the morning glow never dies; At night, due to the sunshine heating in one day, the temperature is high, and there is generally not much water vapor in the low-altitude atmosphere, but due to the weakening of convection, dust may be concentrated in the lower level in large quantities. If there is a bright sunset glow, it is mainly caused by the scattering of sun light by dry particles such as dust, indicating that the weather in the west is relatively dry. According to the law of airflow moving from west to east, the local weather will not get worse in the future, so there is a saying that "the sunset clouds travel along Wan Li Road". Of course, this is just a general rule. You really need to grasp the appearance of God and take the lead in traveling.

Colorful clouds sometimes appear on the horizon around sunrise and sunset. The chardonnay seen in the eastern sky before and after sunrise is called Chenxia, and the chardonnay before and after sunset is called Dusk.

Haze is the result of sunlight passing through the thick atmosphere around sunrise and sunset and being scattered by a large number of air molecules. When there are many impurities in the air, such as dust and water vapor, its color is more obvious. If there are clouds, they will also be dyed orange and red.