The temperature on October 11, 1917 was between 2.8 °C and 12.7 °C and averaged 7.8 °C. There was 3.3 mm of rain. There was 6.9 hours of sunshine (63%). The average windspeed was 3 Bft (moderate breeze) and was prevailing from the west-northwest. Source: KNMI
In The Netherlands , there was from August 29, 1913 to September 9, 1918 the cabinet Cort van der Linden, with Mr. P.W.A. Cort van der Linden (liberaal) as prime minister.
February 3 » First World War: The American entry into World War I begins when diplomatic relations with Germany are severed due to its unrestricted submarine warfare.
April 2 » World War I: United States President Woodrow Wilson asks the U.S. Congress for a declaration of war on Germany.
April 12 » World War I: Canadian forces successfully complete the taking of Vimy Ridge from the Germans.
May 13 » Three children report the first apparition of Our Lady of Fátima in Fátima, Portugal.
July 20 » World War I: The Corfu Declaration, which leads to the creation of the post-war Kingdom of Yugoslavia, is signed by the Yugoslav Committee and Kingdom of Serbia.
August 18 » A Great Fire in Thessaloniki, Greece destroys 32% of the city leaving 70,000 individuals homeless.
Day of death June 21, 1981
The temperature on June 21, 1981 was between 7.2 °C and 14.0 °C and averaged 11.3 °C. There was 0.1 mm of rain during 0.2 hours. There was 1.2 hours of sunshine (7%). The partly or heavily clouded was. The average windspeed was 2 Bft (weak wind) and was prevailing from the north-northwest. Source: KNMI
In The Netherlands , there was from Monday, December 19, 1977 to Friday, September 11, 1981 the cabinet Van Agt I, with Mr. A.A.M. van Agt (CDA/KVP) as prime minister.
In The Netherlands , there was from Friday, September 11, 1981 to Saturday, May 29, 1982 the cabinet Van Agt II, with Mr. A.A.M. van Agt (CDA) as prime minister.
January 28 » Ronald Reagan lifts remaining domestic petroleum price and allocation controls in the United States helping to end the 1979 energy crisis and begin the 1980s oil glut.
May 13 » Mehmet Ali Ağca attempts to assassinate Pope John Paul II in St. Peter's Square in Rome. The Pope is rushed to the Agostino Gemelli University Polyclinic to undergo emergency surgery and survives.
June 7 » The Israeli Air Force destroys Iraq's Osiraq nuclear reactor during Operation Opera.
August 1 » MTV begins broadcasting in the United States and airs its first video, "Video Killed the Radio Star" by The Buggles.
November 25 » Pope John Paul II appoints Joseph Cardinal Ratzinger (the future Pope Benedict XVI) Prefect of the Congregation for the Doctrine of the Faith.
December 13 » General Wojciech Jaruzelski declares martial law in Poland, largely due to the actions by Solidarity.
When copying data from this family tree, please include a reference to the origin: Hans Weening, "Family tree Weening", database, Genealogy Online (https://www.genealogieonline.nl/stamboom-weening/I188816.php : accessed February 16, 2026), "Sietze Sietzema (1917-1981)".
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