Why does the sky change colors at sunrise and sunset

As the sun's angle changes, (because of the rotation of the earth) the sun slowly begins to shine more or less sunshine slowly. When sunsets and sunrises occur, the color of the sky changes because the sunshine is starting to fade out or in.

I put it in my own words so you don't have to worry about plagiarism :)

the answer for sodium is 0.186

the answer for rubidium is 0.251

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