Stay indoors at sunrise and travel thousands of miles at sunset. What does this mean?

"Don't go out at sunrise, but go to Wan Li Road at sunset" means that if you get up in the morning and see a sunrise on the horizon, the weather today may be bad, so pay attention. If you see the sunset glow on the horizon at night, it is likely to be a fine day the next day.

This is a rural proverb, which has been deeply believed by farmers and is an important guide to guide agricultural production until today.

This sentence is not groundless, it has scientific basis:

Sunglow-Sunglow appears in the east, while there are thick clouds in the western sky. Affected by the westerlies, there will be systematic precipitation weather.

Sunset-Sunset appears in the west, so there is generally no large-scale cloud in the western sky, and the sun shines directly on the earth, which is a sign that the systematic weather has crossed the border.

Extended data

Sunglow:

Under the sun, there is strong air convection and more dust in the atmosphere. At this time, a glow appears, and the red light appears pure, indicating a sunny day. The rainy weather in most parts of China mainly comes from two directions. First, influenced by the westerlies, the systematic weather process moves from west to east. If there is morning glow in the east and thick clouds in the west, there will be systematic precipitation.

The other is the convective precipitation process. With the strengthening of sunshine, air convection is enhanced, so it often moves with the sun, forming local rainfall around noon. If it is sunny after the rain, the morning glow appears in the east, indicating that the humidity in the atmosphere is relatively high. This is a sign of rain.

Sunset:

The appearance of sunset glow generally indicates that there are no large clouds in the western sky, which is a sign of systematic weather transit. Moreover, due to the weakening of thermal convection at night, it is difficult to form rainfall.

At dusk, sunlight passes through the atmosphere obliquely, and there is a long optical path in the lower atmosphere. Due to the scattering and absorption of light by air molecules, water vapor and dust particles in the atmosphere, sunlight is greatly attenuated, and the degree of light attenuation of different colors is different. Therefore, sunlight passing through the atmosphere presents different colors, and these rays can reach people's eyes after being scattered by scattered particles in the atmosphere. This further increases the complexity of the sky color.

The composition and state of the atmosphere are constantly changing, forming all kinds of beautiful rosy clouds. When the humidity in the atmosphere is high, or the system cloud system is close, many large water droplets will be suspended in the air, and these water droplets with different sizes have different scattering effects on various colors of light.

For example, water droplets with a radius smaller than the wavelength of light waves mainly scatter blue light; While water droplets with a radius of 0.5 micron to 1 micron mainly scatter red light. Therefore, sometimes purplish red and brownish red are formed in the sky near the ground. The more water vapor in the atmosphere, the brighter the color of Xiaxia.

References:

Baidu encyclopedia-morning and evening clouds