The temperature on November 22, 1911 was between -2.3 °C and 6.5 °C and averaged 1.0 °C. There was 3.2 hours of sunshine (38%). The average windspeed was 2 Bft (weak wind) and was prevailing from the south. Source: KNMI
April 8 » Dutch physicist Heike Kamerlingh Onnes discovers superconductivity.
April 29 » Tsinghua University, one of mainland China's leading universities, is founded.
October 24 » Orville Wright remains in the air nine minutes and 45 seconds in a glider at Kill Devil Hills, North Carolina.
November 19 » The Doom Bar in Cornwall claimed two ships, Island Maid and Angele, the latter killing the entire crew except the captain.
December 14 » Roald Amundsen's team, comprising himself, Olav Bjaaland, Helmer Hanssen, Sverre Hassel, and Oscar Wisting, becomes the first to reach the South Pole.
December 29 » Sun Yat-sen becomes the provisional President of the Republic of China; he formally takes office on January 1, 1912.
Day of marriage October 12, 1938
The temperature on October 12, 1938 was between 6.4 °C and 15.3 °C and averaged 11.7 °C. There was 0.3 mm of rain during 0.3 hours. There was 2.2 hours of sunshine (20%). The average windspeed was 4 Bft (moderate breeze) and was prevailing from the southwest. Source: KNMI
February 4 » Adolf Hitler appoints himself as head of the Armed Forces High Command.
March 12 » Anschluss: German troops occupy and absorb Austria.
June 23 » The Civil Aeronautics Act is signed into law, forming the Civil Aeronautics Authority in the United States.
September 30 » The League of Nations unanimously outlaws "intentional bombings of civilian populations".
October 14 » The first flight of the Curtiss P-40 Warhawk fighter plane.
November 9 » The Nazi German diplomat Ernst vom Rath dies from gunshot wounds by Herschel Grynszpan, an act which the Nazis used as an excuse to instigate the 1938 national pogrom, also known as Kristallnacht.
When copying data from this family tree, please include a reference to the origin: A. Hakkert , "Family tree Hakkert", database, Genealogy Online (https://www.genealogieonline.nl/stamboom-hakkert/I5683.php : accessed January 28, 2026), "Willem Aart Johan Hakkert (1911-)".
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