On March 7, 2011, shortly after I took this:
This familiar quiet sequence unfolded.
These five images were taken seconds apart and during the last 60 seconds of twilight. Sunset that day occurred at 6:05 in the evening.
I was able to catch the Green Flash!
Notice how the sky abruptly brightened in shot-2 and stayed bright until shot-4.
The famous but seldom seen “green flash” or “emerald flash” that occurs just before the last part of the sun disappears from view at sunset is caused by the same atmospheric refraction and scattering effects that create the red sunset.
A rich subject for debate over the years, the green flash is rarely seen, but its observers wax eloquent about the brilliant green or emerald color when it is seen. In uniform air, the dispersion is apparently so small that the separation of red and green images is not visible. It takes more unusual layering of the atmosphere to enhance the separation.
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