The sun slips slowly downwards to a clear ocean horizon. Ever reddening as it sinks, soon only a thin sliver of the once hot disk is left. Then, as that too shrinks and lessens, it shines forth for just a second in a most vivid emerald green. Then it is gone, only the dark ocean remains. That is the green flash of fable.
Flashes like that do occur. A clear atmosphere produces the best ones but it is not absolutely essential. Sometimes the flash is more yellow, very rarely it is even blue. If you are energetic, observe on a hill or dune and run up after the flash has occurred - you could see another one. There are sunrise flashes too if you are alert for the very place and moment that the sun will appear.
There are other types of flash. Some do not need an ocean horizon. The next few pages describe them and the subtle atmospheric conditions that produce their colour and brilliance. There also some clues as to which sunsets will produce them. |
