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Births on April 30

Roger L. Easton
1921Apr, 30

Roger L. Easton

Roger L. Easton, American scientist, co-invented the GPS (d. 2014)
Roger Lee Easton, Sr. (April 30, 1921 – May 8, 2014) was an American physicist and state representative who was the principal inventor and designer of the Global Positioning System, along with Ivan A. Getting and Bradford Parkinson.

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Events on 1921

  • 15Feb

    Helsinki

    Kingdom of Romania establishes its legation in Helsinki.
  • 20Mar

    Versailles Treaty

    The Upper Silesia plebiscite was a plebiscite mandated by the Versailles Treaty to determine a section of the border between Weimar Germany and Poland.
  • 11Jul

    William Howard Taft

    Former President of the United States William Howard Taft is sworn in as 10th Chief Justice of the U.S. Supreme Court, becoming the only person ever to hold both offices.
  • 29Oct

    Sacco and Vanzetti

    United States: Second trial of Sacco and Vanzetti in Boston, Massachusetts.
  • 11Nov

    Arlington National Cemetery

    The Tomb of the Unknowns is dedicated by US President Warren G. Harding at Arlington National Cemetery.