Los rayos crepusculares en óptica atmosférica, son rayos de luz solar que parecen para irradiar desde un punto único en el cielo. Estos rayos, que fluyen a través de aberturas en las nubes (sobre todo estratocúmulos), o entre otros objetos, son columnas de aire iluminado por el sol separados por oscuras regiones de sombra de nubes. El nombre viene de sus apariciones frecuentes durante las horas crepusculares (amanecer y atardecer), cuando los contrastes entre luz y oscuridad son los más obvios. Crepuscular viene de la palabra latina crepusculum que significa crepúsculo.

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Crepuscular rays /krᵻˈpʌskjᵿlər/ (also known as sunbeams, Sun rays or God 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 twilight 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.

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