All is grey outside. I send you a picture when there were still colours around. It was taken one day before I arrived in Horta. At the end of a sunset a green dot can be observed when the horizon is not obstructed by clouds. For quite some time it’s existence has been questioned. This green flash lasts just one second, sometimes even shorter. If you stare at the red setting sun you are likely to miss it since your retina cells become somewhat insensitive to light in the area where the bright sun has been. On June 28th 24, I took a series of pictures and was lucky to capture this phenomenon on camera. The scientific explanation is that the green end of the light spectrum gets bend more when passing the atmosphere. So you can see the green component of the light, while the red part of the upper limb of the sun is already below the horizon. The blue end of the spectrum gets diffracted when passing the atmosphere. That is the reason why the sky is blue.
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Green Flash
