theophany (n.)

"an appearance of God to man," 1630s, from Late Latin theophania, from Greek theos "god" (from PIE root *dhes-, forming words for religious concepts) + phainein "bring to light, cause to appear, show" (from PIE root *bha- (1) "to shine"). In Middle English "Epiphany" (late 12c.). Ancient Greek Theophaneia was the name of a festival at Delphi during which the statues of Apollo and other gods were displayed to the public.