Sunset is the time in the evening when the sun disappears below the horizon and the sky often changes color.
From 'sun' + 'set', literally describing the sun 'setting' or going down. The phrase has been used in English for many centuries.
The sun never actually 'sets'—the Earth is turning away, but our language keeps the old illusion. 'Sunset' is so emotionally loaded that we even use it to describe the gentle ending of careers, laws, and eras.
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