This is due to the way that light particles diffues or pass through different amounts of differently coloured light. White light is made up of all of the colours in the spectrum, like shown in a rainbow, and when the light (generated from the sun) passes through our atmospher, all other colours of light except for blue are filtered out by the light passing through the atmosphere.
During evenings, or indeed some mornings, the sun is lower in the sky, this means that the light from it has to pass through a greater amount of atmosphere to reach the point that you are at. Due to this, it now filters out all parts of the light spectrum except for the red light, meaning the sky appears red. This is also why, on some rare occasions, the sky can appear green.
The sky isn't always blue. The same properties and effects that make it blue most of the time also make it red and orange around sunrise and sunset. The sky appears blue during the day because the atmosphere scatters the higher frequencies of visible light (blue) more than the lower frequencies (red). This property also makes the nearly-white Sun appear yellow, and red at dawn and sunset.
The sun rays have to travel through a larger atmospheric distance. Most of the blue light and shorter wave lengths are removed by scattering . Only red colour,which is least scatterd is received by our eyes and appear to come from sun .Hence the appearance of sun at sunset or sunrise looks almost flat .lovenish
Sunlight contains all the colors of the rainbow. Particles floating in the air scatter some of the light (usually blue/violet) which is why the sky looks blue. During the early morning (and early evening) the light has to pass through more atmosphere to reach your eyes. The blue/violet has already been scattered away. The longer wavelengths (red and orange) are the ones that get through so that is why the sky is orange during sunrise.
The sky is blue because the atmosphere scatters sunlight. Light with shorter wavelengths (blue, purple, violet) is scattered more in the atmosphere, so the sky appears blue; this is the same reason that sunsets and sunrises appear red and orange: at sunset/sunrise, the sun's light hits the atmosphere at a low angle, increasing the distance that the light must travel through the atmosphere. Thus, more colors are 'scattered out', even the blue-end of the spectrum, leaving red and orange colors.
FALSE!Sunlight appears to be white to the human eye but is actually a mix of all the colors in the rainbow. The blue and violet part of the spectrum has shorter wavelengths than the red and orange part. Shorter wavelength blue and violet light is scattered more strongly than red and orange light. When you look at the sky, you see the light that was redirected by the atmosphere into your line or sight. Since blue and violet is scattered more efficiently that red and orange light, the sky appears blue. When viewing a sunrise or sunset, you see only light that has not been scattered in other directions. The red and orange part of sunlight travels through a maximum length of the atmosphere, so a sunrise and sunset appears to be more orange and reddish.
Earth atmosphere makes it appear that way The same reason the sky is blue. Gas and small particulates in atmosphere scatters blue light far more than it scatters red light. Scattered blue light makes sky look blue in day. Unscattered red light (passing through extra atmosphere too at sunrise and sunset) makes sun look red/orange at sunrise or sunset.
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