Article of the Day: Green Flash

Article of the Day:
Green Flash

A green flash is a refractive phenomenon in which the top edge of the setting—or, less frequently, rising—sun momentarily turns emerald green. It is usually seen over a low distant horizon, such as that of the ocean or a prairie, when the sky is clear. It occurs primarily because the atmosphere acts like a weak prism, refracting sunlight and separating it into different colors. The green color lasts from a fraction of a second to two seconds. What is a green rim and when can it be observed? More…: https://play.google.com/store/apps/details?id=com.tfd.mobile.TfdSearch

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