The temperature on February 18, 1911 was between 7.7 °C and 9.9 °C and averaged 9.4 °C. The average windspeed was 6 Bft (strong wind) and was prevailing from the west-southwest. Source: KNMI
March 29 » The M1911 .45 ACP pistol becomes the official U.S. Army side arm.
April 2 » The Australian Bureau of Statistics conducts the country's first national census.
April 8 » Dutch physicist Heike Kamerlingh Onnes discovers superconductivity.
May 9 » The works of Gabriele D'Annunzio are placed in the Index of Forbidden Books by the Vatican.
July 4 » A massive heat wave strikes the northeastern United States, killing 380 people in eleven days and breaking temperature records in several cities.
July 7 » The United States, UK, Japan, and Russia sign the North Pacific Fur Seal Convention of 1911 banning open-water seal hunting, the first international treaty to address wildlife preservation issues.
Day of marriage May 20, 1939
The temperature on May 20, 1939 was between 1.7 °C and 15.8 °C and averaged 9.1 °C. There was 12.2 hours of sunshine (77%). The average windspeed was 2 Bft (weak wind) and was prevailing from the north. Source: KNMI
In The Netherlands , there was from June 24, 1937 to July 25, 1939 the cabinet Colijn IV, with Dr. H. Colijn (ARP) as prime minister.
In The Netherlands , there was from July 25, 1939 to August 10, 1939 the cabinet Colijn V, with Dr. H. Colijn (ARP) as prime minister.
In The Netherlands , there was from August 10, 1939 to September 3, 1940 the cabinet De Geer II, with Jonkheer mr. D.J. de Geer (CHU) as prime minister.
January 24 » The deadliest earthquake in Chilean history strikes Chillán, killing approximately 28,000 people.
March 28 » Spanish Civil War: Generalissimo Francisco Franco conquers Madrid after a three-year siege.
June 12 » Shooting begins on Paramount Pictures' Dr. Cyclops, the first horror film photographed in three-strip Technicolor.
September 10 » World War II: The submarine HMSOxley is mistakenly sunk by the submarine HMSTriton near Norway and becomes the Royal Navy's first loss of a submarine in the war.
September 30 » World War II: General Władysław Sikorski becomes prime minister of the Polish government-in-exile.
December 17 » World War II: Battle of the River Plate: The Admiral Graf Spee is scuttled by Captain Hans Langsdorff outside Montevideo.
Day of death February 23, 1979
The temperature on February 23, 1979 was between -0.3 °C and 3.7 °C and averaged 1.7 °C. There was 3.4 mm of rain during 2.7 hours. There was -0.1 hours of sunshine (0%). The heavily clouded was. The average windspeed was 2 Bft (weak wind) and was prevailing from the 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.
March 5 » Soviet probes Venera 11, Venera 12 and the German-American solar satellite Helios II all are hit by "off the scale" gamma rays leading to the discovery of soft gamma repeaters.
March 16 » Sino-Vietnamese War: The People's Liberation Army crosses the border back into China, ends the war.
July 12 » The island nation of Kiribati becomes independent from the United Kingdom.
October 15 » Supporters of the Malta Labour Party ransack and destroy the Times of Malta building and other locations associated with the Nationalist Party.
October 18 » The Federal Communications Commission (FCC) begins allowing people to have home satellite earth stations without a federal government license.
November 16 » The first line of Bucharest Metro (Line M1) is opened from Timpuri Noi to Semănătoarea in Bucharest, Romania.
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/I112928.php : accessed October 17, 2026), "Ids van der Ploeg (1911-1979)".
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