NASA's October 20 Astronomy Picture of the Day shows a rainbow-like fan and rays that appear to converge toward a false Sun near the opposite horizon. The actual Sun is behind the observer, as rainbow geometry requires; gaps in clouds create anticrepuscular rays that produce the illusion.
The photograph was captured on a phone in Italy, a reminder that unusual light is often more important than expensive gear. Action: open the image and look for opposing rays on the next partly cloudy sunset.
