Crepuscular Rays in Tomina
Alqueva´s Dark Sky Reserve | Atmospheric & Optical phenomena | Best Of | by Year: 2013 | Clouds and Fogs Heavens | Sunrise and Sunset | Twilight Dawn & Dusk
Image captured near Convento da Tomina region, a area inside the great Contenda homestead, near Moura and Barrancos, Portugal. In the sky we could see the dramatic effect of the phenomenon known as “Crepuscular rays, in atmospheric optics, are rays of sunlight that appear to radiate from the point in the sky where the sun is located. These rays, which stream through gaps in clouds (particularly stratocumulus) or between other objects, are columns of sunlit air separated by darker cloud-shadowed regions. Despite seeming to converge at a point, the rays are in fact near-parallel shafts of sunlight, and their apparent convergence is a perspective effect (similar, for example, to the way that parallel railway lines seem to converge at a point in the distance).”
“The name comes from their frequent occurrences during crepuscular hours (those around dawn and dusk), when the contrasts between light and dark are the most obvious. Crepuscular comes from the Latin word “crepusculum”, meaning twilight.”
Canon 50D – ISO500, f/13; Exp. 1/320s ; 10mm. 26/04/2013 19h16
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