Is Xia Guang in the morning or at night?

Xia Guang is in the morning. Sunlight is a colorful phenomenon caused by the refraction, scattering and selective absorption of sunlight by the sky near the sun at sunrise or sunset. Haze is formed by the refraction, scattering and selective absorption of solar light by suspended particles (dust, ice crystals, water droplets and other impurities) in the atmosphere. The radius of these suspended particles is much smaller than the wavelength of sunlight, and Rayleigh scattering will occur when sunlight hits these particles. The blue, purple, cyan and other colors of sunlight scatter a lot because of their short wavelength, while the red, orange, yellow and other colors have long light transmission ability and are not easy to be scattered, so the chardonnay I see is mostly red and orange.

Summer proverb:

Smog is a common natural phenomenon in people's daily life, which appears in the morning and evening. Through the accumulation of long-term experience, the working people in China have summed up some proverbs, through which we can understand the future weather changes. As the saying goes, "When the sun sets, the northwest sky is full of red, either rain or wind": When the sun sets, a red glow (transmitted glow) appears in the northwest sky, indicating that there are a lot of water vapor and concretions in the atmosphere, clouds have formed, and there is a great possibility of precipitation. Rumor: "The morning glow does not go out, but the evening glow travels thousands of miles": The appearance of the morning glow shows that the western sky is cloudy in the morning and the sky is in an unstable state. With the rising of the sun, air convection develops further. Because the atmospheric fluctuation develops from west to east, the convective movement in the west moves eastward in the morning, which is easy to cause rainfall. After the sun went down in the evening, the convection developed eastward, the air gradually returned to a stable state, and the weather was generally fine. There are also proverbs that condense the wisdom of the working people in our country, such as "It rains in the morning and fires in the evening", "It is not too late to burn in the morning, but it burns for nine days in the evening", "Let it shine in the morning, wait for the water to make tea, let it shine in the evening and kill the frog" and "Let it rain in the morning and burn its head at dusk".