The temperature on April 14, 1927 was between 8.4 °C and 10.8 °C and averaged 9.4 °C. There was 12.6 mm of rain. The average windspeed was 4 Bft (moderate breeze) and was prevailing from the west-southwest. Source: KNMI
February 23 » German theoretical physicist Werner Heisenberg writes a letter to fellow physicist Wolfgang Pauli, in which he describes his uncertainty principle for the first time.
March 11 » In New York City, Samuel Roxy Rothafel opens the Roxy Theatre.
June 27 » Prime Minister of Japan Tanaka Giichi convenes an eleven-day conference to discuss Japan's strategy in China. The Tanaka Memorial, a forged plan for world domination, is later claimed to be a secret report leaked from this conference.
July 16 » Augusto César Sandino leads a raid on U.S. Marines and Nicaraguan Guardia Nacional that had been sent to apprehend him in the village of Ocotal, but is repulsed by one of the first dive-bombing attacks in history.
September 22 » Jack Dempsey loses the "Long Count" boxing match to Gene Tunney.
October 4 » Gutzon Borglum begins sculpting Mount Rushmore.
Day of marriage August 16, 1952
The temperature on August 16, 1952 was between 12.1 °C and 19.9 °C and averaged 16.0 °C. There was 1.0 mm of rain during 1.3 hours. There was 7.0 hours of sunshine (48%). The partly clouded was. The average windspeed was 3 Bft (moderate breeze) and was prevailing from the south-southwest. Source: KNMI
February 6 » Elizabeth II becomes Queen of the United Kingdom and her other Realms and Territories and Head of the Commonwealth upon the death of her father, George VI. At the exact moment of succession, she was in a tree house at the Treetops Hotel in Kenya.
February 21 » The British government, under Winston Churchill, abolishes identity cards in the UK to "set the people free".
July 26 » King Farouk of Egypt abdicates in favor of his son Fuad.
August 15 » A flash flood drenches the town of Lynmouth, England, killing 34 people.
October 3 » The United Kingdom successfully tests a nuclear weapon to become the world's third nuclear power.
December 20 » A United States Air Force C-124 crashes and burns in Moses Lake, Washington killing 87.
Day of death November 20, 1986
The temperature on November 20, 1986 was between 2.5 °C and 11.3 °C and averaged 6.0 °C. There was 14.6 mm of rain during 6.1 hours. 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 Thursday, November 4, 1982 to Monday, July 14, 1986 the cabinet Lubbers I, with Drs. R.F.M. Lubbers (CDA) as prime minister.
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.
January 28 » Space Shuttle program: STS-51-L mission: Space Shuttle Challenger disintegrates after liftoff, killing all seven astronauts on board.
February 28 » Olof Palme, 26th Prime Minister of Sweden, is assassinated in Stockholm.
March 27 » A car bomb explodes outside Russell Street Police HQ in Melbourne, Australia, killing one police officer and injuring 21 people.
April 15 » The United States launches Operation El Dorado Canyon, its bombing raids against Libyan targets in response to a discotheque bombing in West Germany that killed two U.S. servicemen.
April 25 » Mswati III is crowned King of Swaziland, succeeding his father Sobhuza II.
September 6 » In Istanbul, two terrorists from Abu Nidal's organization kill 22 and wound six congregants inside the Neve Shalom Synagogue during Shabbat services.
When copying data from this family tree, please include a reference to the origin: Joop Klavers, "Family tree Klavers", database, Genealogy Online (https://www.genealogieonline.nl/stamboom_klavers/I3655.php : accessed February 17, 2026), "Jan Gruppen (1927-1986)".
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