APOD
Astronomy Picture of the Day
Discover the cosmos! Each day a different image or photograph of our fascinating universe is featured, along with a brief explanation written by a professional astronomer.
An Anticrepuscular Rainbow FanExplanation: This is an unusual rainbow. For one thing, the rainbow is not complete, appearing only in a sunlit fan — but that by itself is not very unusual. What is most unusual is the fake location of the Sun. The Sun appears to be toward the front, just below those hills — but it is not. That is not how rainbows work. Rainbows involve a backward reflection from falling rain, so that the Sun must really be behind you. In this case, gaps between clouds near the setting Sun allowed rays to cross the entire sky and appear to converge in front, an unusual phenomenon called anticrepuscular rays. The photo was taken with a phone last week at sunset in Presenzano, Italy. The seemingly reverse rainbow was noticed when hanging up laundry.
Tomorrow’s picture: open space
Date October 20, 2026 Credit & Copyright Aurelia Degli Esposti Authors & editors: Robert Nemiroff, Jerry Bonnell, Cecilia Chirenti, Keighley Rockcliffe A service of: ASD at NASA / GSFC,NASA Science Activation & Michigan Tech. U. Random APOD Generator Yesterday’s Image APOD: 2026 October 19 – Treble Clef: Unusual X-ray Hot Radio SourceTomorrow’s Image
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