Crepuscular Rays and Shadows in the Sky of Las Vegas


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As seen above the city that never sleeps, Las Vegas, this cityscape shows the twilight sky with 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 like mountains, 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.”

PT: Visto acima da cidade que nunca dorme, Las Vegas, nesta cityscape captada ao crepúsculo é possível ver o forte fenómeno dos “Raios Crepusculares e Sombras” projectadas no céu. Estes raios de luz solar irradiam do ponto do céu onde o sol se encontra, fluindo através de lacunas nas nuvens (particularmente estratocumulos) ou entre outros objetos como montanhas. São basicamente colunas de ar iluminadas pelo sol, separadas por regiões mais sombrias e sombreadas. Apesar de parecerem convergir de um único ponto, os raios são, de facto, os eixos paralelos da luz solar e a sua convergência aparente é um efeito de perspectiva (semelhante, por exemplo, ao modo como as linhas ferroviárias paralelas parecem convergir em um ponto distante).

 

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