What is Light? - Light in the Natural World

Do Ships Glow Eerily on Dark Nights? (1)

Seafarers used to witness a mysterious phenomenon back in the days when sailing ships were the only means of sea travel. After encountering tempests and violent thunderstorms, they sometimes saw what appeared to be a pale fire burning at the tip of the mast. Thinking it was a sign of God's blessing, they named the phenomenon Saint Elmo's Fire after the patron saint of sailors. It can also be seen on church steeples, mountaintops, the tips of antenna and other such places.

We now know that Saint Elmo's Fire is caused by electric potential differences in the atmosphere.