Zenit reports that Pope Pius XII experienced the “miracle of the sun.” From the pope’s diary:
The sun, which was still quite high, looked like a pale, opaque sphere, entirely surrounded by a luminous circle without the slightest bother. There was a very light little cloud in front of it.
“(T)he opaque sphere … moved outward slightly, either spinning, or moving from left to right and vice versa. But within the sphere, you could see marked movements with total clarity and without interruption.”
Don’t try this at home.
Let me repeat: don’t try this at home.
But anybody can see this phenomenon, though at great risk to their eyes. I saw it when I was a kid. The retina focuses on the sun, darkening it so the eyes can tolerate the brightness. Small movements of the eyes make the sun appear to dance or spin. It’s a biological reaction to a dangerous act that can put your eyes out. If the sun is behind a thin cloud, it works pretty well, though still with much danger.
According to Zenit, the pope “said he saw the phenomenon various times, considering it a confirmation of his plan to declare the dogma.”
The dogmatic declaration of the Assumption of the Blessed Mother into heaven is rooted in part on a biological reaction of the human retina.