Astronomy enthusiasts and lovers of natural wonders have been captivated by a truly unique spectacle in recent days. An amateur photographer in Italy has captured an image of a phenomenon rarely witnessed even by seasoned observers – an anticrepuscular rainbow. Unlike the common rainbows we typically see after rain, this one appears in a dramatically different part of the sky and possesses a distinctive shape.
What is an Anticrepuscular Rainbow?
In contrast to a conventional rainbow, which forms when sunlight reflects off water droplets in the atmosphere and appears opposite the sun, an anticrepuscular rainbow manifests in the direction directly opposite the sun. It is a result of what are known as anticrepuscular rays. These rays are shafts of light emanating from the antisolar point (the point directly opposite the sun in the sky) and appear to converge at that point. They are formed when sunlight passes through gaps in clouds and is scattered. Consequently, the light source seems to be directly in front of the viewer, even though the sun is actually behind them.
A Photograph That Became a Sensation
A photograph taken last week during sunset in the Italian town of Precenzano showcases an incomplete rainbow that resembles a fan. This effect is achieved because the sun’s rays, passing through scattered clouds, stretch across the sky and seem to converge directly in front of the observer. The photographer serendipitously noticed this remarkable phenomenon while hanging laundry. This serves as a reminder that even in our everyday lives, with careful observation, we can witness true cosmic wonders unfolding above us.
Source: NASA
