On This Day

What Happened in May 1618

Historical Events

Scientific Discovery

May 15 German astronomer Johannes Kepler discovers the third of his three planetary laws his "harmonics law"

  • May 23 Second Defenestration of Prague: Two Catholic Lords Regent and their secretary are thrown out of a window and amazingly are not seriously injured by the 70 foot (21m) fall. Triggers the Thirty Years' War.