Why is there Xia Hong sometimes at night?

Because at dusk, sunlight passes through the atmosphere obliquely, and the optical path is long in the lower atmosphere, sunlight is greatly attenuated due to the scattering and absorption of light by air molecules, water vapor and dust particles in the atmosphere, and the attenuation of light of different colors is different.

Therefore, sunlight passing through the gas layer presents different colors, and these rays can only 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.

The wonders in the atmosphere are not accidental, they are the reflection of the state of atmospheric movement.

The change of wonders in the sky is often a sign of atmospheric change. The working people in our country have rich experience in judging weather changes by using these phenomena. For example, using Chardonnay to predict the future weather. According to the formation principle of chardonnay, a bright red morning glow appears in the morning, indicating that there are many water droplets in the atmosphere and clouds have invaded the area from the west, thus indicating that the weather will turn to rain.

A fiery red or golden sunset glow appears, indicating that there is no cloud in the west, and the sunlight can penetrate to cause the sunset glow, that is, the weather in the upper reaches of the area has cleared up. In this way, the weather in this area will clear up after the clouds that originally enveloped this area move eastward.