On This Day

What Happened in May 1618

Historical Events


InventionScientific Discovery

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

Astronomer Johannes Kepler
Astronomer
Johannes Kepler
  • 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.