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The Guardian - UK
The Guardian - UK
Environment
Jim Perrin

Country diary: A brilliant flash of luck as I was looking west

Sun green flashGreen flash, or green flash, is an atmospheric optical phenomenon that occurs shortly after sunset or shortly before sunrise, in which a green dot can be seen, usually for one or two seconds, over the position of the sun. This was captured at sunset on the beach of Cabo Rojo in the Dominican Republic.
‘Technically an optical illusion … the atmosphere separates the sunlight into its composite colours. The shorter wavelengths – blue, violet – refract more strongly than longer ones.’ Photograph: Marvin del Cid/Getty Images

Have you ever seen the “green flash”? If not, don’t be discouraged. I’ve witnessed this rare meteorological phenomenon on only three occasions, the last of these just a few days ago. As with so much evanescence in nature, attempt to hunt an experience down and you must be prepared for disappointment. The green flash is no exception.

I was reminded of my encounters with it, both here and on top of Mowing Word in Pembroke, through reading Kai Bird’s monumental biography of the great atomic physicist Robert Oppenheimer recently. The author describes Oppenheimer inviting a companion one brilliant sunset to take a walk at Cruz Bay in the US Virgin Islands:

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