The sky appears orange-red during sunset or sunrise because of a different type of scattering called Rayleigh scattering. As the sun sets, its light must travel through more of the Earth's atmosphere to reach our eyes. This means that more of the shorter (bluer) wavelengths are scattered away, leaving more of the longer (redder) wavelengths to reach our eyes.

Additionally, during sunset and sunrise, the angle at which sunlight enters the atmosphere changes, causing the light to pass through more of the Earth's atmosphere than during the middle of the day. This causes the light to be scattered even more, creating the beautiful orange and red hues that we associate with these times of day.

In essence, the color of the sky is a complex interplay of the physics of light and the properties of our atmosphere. The way that light scatters and interacts with different particles in the air creates the colors that we see, and these colors can change depending on a variety of factors such as the time of day and the composition of the atmosphere.
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