Why is the sky red at night, and why does the sky turn red at night

Are you talking about the sky directly above? If so, then:

If you think about the weather at that time, was it rainy and snowy?

This may be due to the diffuse reflection of the city's lights into the clouds in the sky ......Or maybe you have some metallurgical plant that dumps liquid metal and turns the sky red......Of course, this has nothing to do with "Dawn".

Of course, it may also be that when the day is about to dawn, due to the rain and snow, there is a wide range of morning glow. Others have made it very clear. If so, when I didn't say

It is the refraction of water molecules in the atmosphere when the sun is about to come out, and the infrared wave is relatively long

The scattering of light is like angelic blue during the day, with different wavelengths.

In the morning, red light is refracted and scattered through the atmosphere, so it is red.

The red wavelength is ...... longestJust as the moon is sometimes yellow, the atmosphere refracts different light waves differently.

The wavelength of red light is comparatively longer.

The refractive index is large. So the light will travel from below the horizon along the curve.

When I was in the daytime, the angel was blue, and at night the sky was red, because the ground was illuminated.

The sun is rising. Wow click.

1. Because of the scattering of light, the light with a relatively long wavelength in the sunlight encounters the dust in the air and is blocked for scattering, so the sky at night will be red Generally called fire clouds.

2. It is related to the distance of the sun, the sun in the evening is far away from the sky, the wavelength of red light is more than the wavelength of light in other bands, and the penetration is also strong, at a long distance, most of the red light can shine on the clouds above, and other lights cannot, so the sky in the evening is red.

3. This is related to the water vapor in the sky, in the spectrum, the refractive index of red in the water is larger than that of other colors of light, so when other lights are invisible, red light can still be seen.

4. It is the street lamp that the clouds in the sky reflect the ground, because most of the street lamps are warm colors, and the red light is the lowest frequency in the visible light, and the penetration is quietly poor, and it is reflected by the clouds.

5. To sum up, this is the reason why the sky turns red at night.

The sunlight travels along the horizon for a long part of the atmosphere, and most of the blue glass beads are blocked by the air net, bouncing aside, and only the red glass beads reach our eyes unhindered. That's how the morning and evening sky turns red.

However, the higher the sun rises, the shorter the path of light through the atmosphere, and the blocking effect begins to wane. The sky is brightening and the stars are dimming. When the first rays of sunlight showed their faces on the horizon, we went home like Count Dracula, we avoided the day and waited for the next night.

Celestial bodies appear redder from Earth than from space because redder wavelengths from celestial bodies penetrate the atmosphere more easily than bluer wavelengths to reach the ground.

The red color in the sky at night is not a fire cloud, it may be because you are in a city, and the city lights shine on the cloudy low clouds and become red after reflection and scattering, which shows that your city is more heavily polluted.

If you're in the countryside, you won't be able to see the colors on cloudy nights.