The temperature on June 4, 1911 was between 12.8 °C and 25.6 °C and averaged 18.1 °C. There was 7.5 mm of rain. There was 4.4 hours of sunshine (27%). The average windspeed was 2 Bft (weak wind) and was prevailing from the northeast. Source: KNMI
February 18 » The first official flight with airmail takes place from Allahabad, United Provinces, British India (now India), when Henri Pequet, a 23-year-old pilot, delivers 6,500 letters to Naini, about 10 kilometres (6.2mi) away.
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.
October 5 » The Kowloon–Canton Railway commences service.
October 10 » The day after a bomb explodes prematurely, the Wuchang Uprising begins against the Chinese monarchy.
Day of marriage May 2, 1938
The temperature on May 2, 1938 was between 3.4 °C and 11.0 °C and averaged 7.8 °C. There was 0.1 mm of rain. There was -0.1 hours of sunshine (0%). The average windspeed was 3 Bft (moderate breeze) and was prevailing from the east-northeast. Source: KNMI
June 7 » Second Sino-Japanese War: The Chinese Nationalist government creates the 1938 Yellow River flood to halt Japanese forces. Five hundred to nine hundred thousand civilians are killed.
June 7 » The Douglas DC-4E makes its first test flight.
June 23 » The Civil Aeronautics Act is signed into law, forming the Civil Aeronautics Authority in the United States.
July 10 » Howard Hughes begins a 91-hour airplane flight around the world that will set a new record.
October 10 » Abiding by the Munich Agreement, Czechoslovakia completes its withdrawal from the Sudetenland.
Day of death August 15, 1988
The temperature on August 15, 1988 was between 9.5 °C and 19.8 °C and averaged 16.1 °C. There was 4.3 hours of sunshine (29%). The partly or heavily clouded was. The average windspeed was 2 Bft (weak wind) and was prevailing from the west. Source: KNMI
In The Netherlands , there was from Tuesday, November 4, 1986 to Tuesday, November 7, 1989 the cabinet Lubbers II, with Drs. R.F.M. Lubbers (CDA) as prime minister.
March 16 » Iran–Contra affair: Lieutenant Colonel Oliver North and Vice Admiral John Poindexter are indicted on charges of conspiracy to defraud the United States.
March 17 » A Colombian Boeing 727 jetliner, Avianca Flight 410, crashes into a mountainside near the Venezuelan border killing 143.
August 20 » Iran-Iraq War: A ceasefire is agreed after almost eight years of war.
September 7 » Abdul Ahad Mohmand, the first Afghan in space, returns to Earth after nine days on the Mir space station.
November 15 » The first Fairtrade label, Max Havelaar, is launched in the Netherlands.
December 12 » The Clapham Junction rail crash kills thirty-five and injures hundreds after two collisions of three commuter trains—one of the worst train crashes in the United Kingdom.
When copying data from this family tree, please include a reference to the origin: P. Koenen, "Family tree Koenen", database, Genealogy Online (https://www.genealogieonline.nl/stamboom-koenen/I2348.php : accessed December 24, 2025), "Antonia "To" Valkenburg (1911-1988)".
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