Here is what the page “APOD: Anticrepuscular Rainbow Fan Captured in Wyoming Skies” contains. NASA's Astronomy Picture of the Day for October 20, 2026, features a rare anticrepuscular rainbow fan photographed over Wyoming. Anticrepuscular rays are parallel beams of sunlight that appear to converge at the antisolar point, directly opposite the sun, due to perspective. This phenomenon is less commonly seen than crepuscular rays, which radiate from the sun at dawn or dusk. The image captures a colorful fan of red, orange, and yellow hues, created by sunlight scattered through atmospheric particles.
The photograph was taken by an astrophotographer, whose name is not provided in the source. Understanding such optical displays helps illustrate how light interacts with Earth's atmosphere, a topic of interest for both scientists and skywatchers. The APOD entry encourages viewers to appreciate the beauty and physics of everyday sky phenomena. This listing links straight to the original page, where the content is available in full.