A photograph taken in Presenzano, Italy, captures the rare atmospheric phenomenon of anticrepuscular rays appearing as a reverse rainbow.
Key facts
- •The phenomenon is identified as anticrepuscular rays, which appear to converge in front of the observer.
- •Standard rainbows require the Sun to be behind the observer, unlike this specific light display.
- •The image was captured in Presenzano, Italy, during sunset.
- •The photographer discovered the light pattern while hanging up laundry.
NASA's Astronomy Picture of the Day for October 20, 2026, highlights an unusual atmospheric event captured in Presenzano, Italy. The image shows what appears to be a reverse rainbow, a phenomenon caused by anticrepuscular rays during sunset.
Understanding the Phenomenon
While rainbows typically require the Sun to be positioned behind the observer to reflect off falling rain, this image displays a different effect. Gaps in clouds near the setting Sun allowed light rays to cross the sky and converge in front of the observer, creating the appearance of a fan-shaped rainbow.
Origin of the Photograph
The photograph was taken with a phone at sunset in Presenzano, Italy, last week. The photographer noticed the unusual light display while hanging up laundry.
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This article was independently rewritten by ManyPress editorial AI from reporting originally published by NASA Breaking News.
