The Ady Gil, a ship owned by Sea Shepherd, is sunk during a skirmish with the Japanese Whaling Fleet's Shōnan Maru.

American Civil Rights Movement: Edgar Ray Killen is arrested as a suspect in the 1964 murders of three civil rights workers.

A chemical fire in an apartment complex in Manila, Philippines, leads to the discovery of plans for Project Bojinka, a mass-terrorist attack.

Nancy Kerrigan is clubbed on the knee at the U.S. Figure Skating Championships in Detroit.

The Crown of St. Stephen (also known as the Holy Crown of Hungary) is returned to Hungary from the United States, where it was held after World War II.

In response to the 1973 energy crisis, daylight saving time commences nearly four months early in the United States.

Vietnam War: United States Marine Corps and ARVN troops launch "Operation Deckhouse Five" in the Mekong River delta.

The first Asian Socialist Conference opens in Rangoon, Burma.

The United Kingdom recognizes the People's Republic of China. The Republic of China severs diplomatic relations with the UK in response.

Pan American Airlines becomes the first commercial airline to schedule a flight around the world.

President Franklin Delano Roosevelt delivers his Four Freedoms Speech in the State of the Union Address.

The Supreme Court of the United States rules that the 1933 Agricultural Adjustment Act is unconstitutional in the case United States v. Butler et al.

Thomas Edison submits his last patent application.

The first diesel-engined automobile trip is completed, from Indianapolis, Indiana, to New York City.

Mother Teresa arrives in Calcutta to begin her work among India's poorest and sick people.

King Alexander of the Serbs, Croats and Slovenes suspends his country's constitution (the January 6th Dictatorship).

New Mexico is admitted as the 47th U.S. state.

Maria Montessori opens her first school and daycare center for working class children in Rome.

The Washington National Cathedral is chartered by Congress. The charter is signed by President Benjamin Harrison.

The inauguration of the Musikverein in Vienna.

President-elect of the United States Franklin Pierce and his family are involved in a train wreck near Andover, Massachusetts.

Samuel Morse first successfully tests the electrical telegraph.

In the Battle of Jersey, the British defeat the last attempt by France to invade Jersey.

The Committee of Inquiry on the South Sea Bubble publishes its findings.

Joseph, son of Emperor Leopold I, becomes King of the Romans.

English Restoration: The Fifth Monarchists unsuccessfully attempt to seize control of London.

English Civil War: The Rump Parliament votes to put Charles I on trial.

The Union of Atrecht is signed.

King Henry VIII of England marries Anne of Cleves.

The first Mass in the New World is celebrated at La Isabela, Hispaniola.

Byzantine Emperor Constantine XI is crowned at Mistra.

Philip of Swabia becomes King of the Romans.

Harold Godwinson is crowned King of England.