I dunno what you call the sunlight when it breaks through a hole in the clouds, but in architecture such a hole in the ceiling is sometimes placed and that hole is called an oculus.

Sunburst regards,
DubDub
Edit:0 Just because it's interesting from AHD:

vNOUN: Inflected forms: pl. oc·u·li (-l)
Architecture An eyelike opening or ornament, especially: a. A round window. b. A circular opening at the apex of a dome.
ETYMOLOGY: Medieval Latin, from Latin, eye. See okw- in Appendix I.