Sheen saw three possible interpretations of the Miracle of the Sun. https://www.ncregister.com/commentaries/blessed-fulton-sheen-miracle-of-the-sun

“The first is to regard it as a warning of the atomic bomb, which, like a falling sun, would darken the world,” he wrote. “It conceivably might be a portent of the day when man, Prometheus-like, would snatch fire from the heavens and then rain it down as death on Nagasaki and Hiroshima.”

Then came the second:

“On the other hand, it could be seen as a sign of hope, namely, that the Woman who came out of nature is mightier than the forces of nature.” He explained that “atomic fission is the way the sun lights the world. God put atomic fission in the universe; otherwise we would not have discovered it.

“At Fatima, the fact that Mary could take this great center and seat of atomic power and make it her plaything, the fact that she could swing the sun ‘like a trinket at her wrist,’ is a proof that God has given her power over it, not for death, but for light and life and hope. As Scripture foretold: And now, in heaven, a great portent appeared; a woman clothed with the sun. (Rev. 12:1).”

Sheen also found “a third way of viewing the Miracle of the Sun, and that is to regard it as a miniature and a cameo of what may yet happen to the world, namely, some sudden cataclysm or catastrophe … which would make the world shake in horror as the 70,000 shook at Fatima that day. This catastrophe would be a precocious or uncontrolled explosion of an atomic bomb which would literally shake the earth.”