The following green flashes were captured on 2013-08-09 and 2013-08-15 from Sopelana, Bizkaia with HDD video.
It is a phenomenon between fact and fiction popular by Jules Verne novels and northern legends. Actually it is an optical phenomenon caused by the atmospheric refraction of the last Sun rays before sunset. A short documentary describing both the history and science of this event is in the following video.
This documentary of BBC Coast S07 E01 (on air on 2012-05-13) incoporates the Green Flash that I captured from the same place on 2008-08-17 to illustrate the observation of the event from the Western Islands, UK.
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