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Normally just before the sun actually sets, when the sunset is viewed across the ocean.

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15y ago

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The green flash is a rare optical phenomenon that occurs just after sunset or just before sunrise, when the top rim of the sun briefly turns green as it touches the horizon. This happens because the Earth's atmosphere acts as a prism, separating light into its different colors. The green flash is most commonly observed over bodies of water with a clear, unobstructed horizon.

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10mo ago
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Q: When does the green flash happen?
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