Fátima 'miracle of the sun'

After three shepherd children reported monthly apparitions of a luminous lady who had promised a sign, a crowd estimated at 30,000 to 70,000 gathered on 13 October 1917 and many reported the sun appearing as a dull silver disc that spun, changed colour and plunged toward them, and that their rain-soaked clothes dried. Evidence consists of contemporary newspaper reports, testimony collected by parish and canonical inquiries (some years later), and memoirs; no observatory recorded any change in the sun, and some in the crowd saw nothing. The Church declared the apparitions worthy of belief in 1930. Vallée and others compare it structurally with UAP contact reports; the comparison is about social organisation of a shared experience, not a shared cause.

Collective expectation plus optical effects of looking toward the sun through thinning cloud

• Wikipedia: Miracle of the Sunen.wikipedia.org