What causes the strange green flash at sunset and sunrise on Earth?

There are very special cases, when the sky is very clear and exceptionally transparent, that a green flash can be glimpsed just as the very topmost part of the sun is rising or setting.

What's a green flash and how can I see one?

You've noticed it, right? There's something about L.A.'s light - Los Angeles Times

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Green Flash - Facts and Information - World of Phenomena

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Green flash - Wikipedia

Why sunrise gets later in early January, even though the days are getting longer - The Washington Post