The soft, warm reddish or golden light visible in the western sky just after sunset, caused by the sun illuminating the upper atmosphere.
Compound of 'even' (evening) and 'glow' (a steady light). This is a relatively modern English term created to describe the specific optical phenomenon of atmospheric refraction at dusk, combining two common words for clarity.
Evenglow happens because even though the sun has set for us, it's still shining on the upper atmosphere from below the horizon—the same reason we can see colors in the sky well after the sun disappears.
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