The temperature on May 25, 1911 was between 11.3 °C and 22.0 °C and averaged 16.3 °C. There was 6.4 hours of sunshine (40%). The average windspeed was 2 Bft (weak wind) and was prevailing from the east. Source: KNMI
April 29 » Tsinghua University, one of mainland China's leading universities, is founded.
May 15 » More than 300 Chinese immigrants are killed in the Torreón massacre when the forces of the Mexican Revolution led by Emilio Madero take the city of Torreón from the Federales.
June 16 » IBM founded as the Computing-Tabulating-Recording Company in Endicott, New York.
September 20 » The White Star Line's RMSOlympic collides with the British warship HMSHawke.
November 1 » World's first combat aerial bombing mission takes place in Libya during the Italo-Turkish War. Second Lieutenant Giulio Gavotti of Italy drops several small bombs.
November 3 » Chevrolet officially enters the automobile market in competition with the Ford Model T.
Day of death March 20, 1969
The temperature on March 20, 1969 was between -0.5 °C and 7.1 °C and averaged 3.0 °C. There was 5.7 hours of sunshine (47%). The partly clouded was. The average windspeed was 3 Bft (moderate breeze) and was prevailing from the east-northeast. Source: KNMI
January 19 » Student Jan Palach dies after setting himself on fire three days earlier in Prague's Wenceslas Square to protest about the invasion of Czechoslovakia by the Soviet Union in 1968. His funeral turns into another major protest.
June 22 » The Cuyahoga River catches fire in Cleveland, Ohio, drawing national attention to water pollution, and spurring the passing of the Clean Water Act and the creation of the Environmental Protection Agency.
August 15 » The Woodstock Music & Art Fair opens in upstate New York, featuring some of the top rock musicians of the era.
November 3 » Vietnam War: U.S. President Richard M. Nixon addresses the nation on television and radio, asking the "silent majority" to join him in solidarity on the Vietnam War effort and to support his policies.
November 17 » Cold War: Negotiators from the Soviet Union and the United States meet in Helsinki, Finland to begin SALT I negotiations aimed at limiting the number of strategic weapons on both sides.
November 24 » Apollo program: The Apollo 12 command module splashes down safely in the Pacific Ocean, ending the second manned mission to land on the Moon.
When copying data from this family tree, please include a reference to the origin: J. Ham, "Family tree Ham", database, Genealogy Online (https://www.genealogieonline.nl/stamboom-ham/I60431.php : accessed January 26, 2026), "Harm Heun (1911-1969)".
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