A green flash occure at sunset (and sunrise) when the air is clear and you have a view of the horizon. It is caused by a refraction of the sun’s light (like a prism). They are a bit rare, but occure whenever the conditions are right.
Wow, I've never seen this. Last summer I was in Egypt, where I visited Mount Sinaï. From the summit of this mountain I had a very good view on the horizon, and the air must have been clear, but the sun was very yellow/orange (check it out here).
Greetings, T NL
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Photo taken in Grays Harbor County, WA, USA
Misplaced? Suggest new location