April 30 is the 120th day of the year in the Gregorian calendar (121st in leap years), with 245 days remaining.

  1. 1006 - Supernova SN 1006, the brightest supernova in recorded history, appears in the constellation Lupus.
  2. 1483 - Orbital calculations suggest that on this day Pluto moved inside Neptune's orbit until July 23, 1503.
  3. 1492 - Spain gives Christopher Columbus his commission of exploration.
  4. 1789 - On the balcony of Federal Hall on Wall Street in New York City, George Washington takes the oath of office to become the first elected President of the United States.
  5. 1803 - Louisiana Purchase: The United States purchases the Louisiana Territory from France for $15 million, more than doubling – overnight – the size of the young nation.
  6. 1812 - The Territory of Orleans becomes the 18th U.S. state under the name Louisiana.
  7. 1900 - Hawaii becomes a territory of the United States, with Sanford B. Dole as governor.
  8. 1925 - Automaker Dodge Brothers, Inc is sold to Dillon, Read & Company for USD $146 million plus $50 million for charity.
  9. 1938 - The animated cartoon short Porky's Hare Hunt debuts in movie theaters, introducing Happy Rabbit.
  10. 1939 - Franklin D. Roosevelt becomes the first President of the United States to appear on television.
  11. 1939 - The 1939 New York World's Fair opens.
  12. 1945 - Adolf Hitler and Eva Braun commit suicide after being married for one day.
  13. 1947 - In Nevada, the Boulder Dam is officially renamed Hoover Dam again.
  14. 1966 - The Church of Satan is founded.
  15. 1991 - A tropical cyclone hits Bangladesh killing an estimated 138,000 people.
  16. 1993 - The World Wide Web was born at CERN.
  17. 1993 - During a tennis match between #1 female tennis player Monica Seleš and Magdalena Maleeva, Günter Parche plunged a steak knife between Seleš's shoulderblades. Seleš did not return to competitive tennis for over two years.
  18. 1995 - U.S. President Bill Clinton became the first U.S. President to visit Northern Ireland.
  19. 1997 - Ellen DeGeneres's character comes out of the closet on the sitcom Ellen.