The temperature on May 19, 1909 was between 4.4 °C and 17.7 °C and averaged 11.7 °C. There was 9.6 hours of sunshine (61%). The average windspeed was 2 Bft (weak wind) and was prevailing from the west. Source: KNMI
February 23 » The AEA Silver Dart makes the first powered flight in Canada and the British Empire.
March 10 » By signing the Anglo-Siamese Treaty of 1909, Thailand relinquishes its sovereignty over the Malay states of Kedah, Kelantan, Perlis and Terengganu, which become British protectorates.
March 31 » Serbia formally withdraws its opposition to Austro-Hungarian actions in the Bosnian Crisis.
April 11 » The city of Tel Aviv is founded.
July 16 » Persian Constitutional Revolution: Mohammad Ali Shah Qajar is forced out as Shah of Persia and is replaced by his son Ahmad Shah Qajar.
December 4 » The Montreal Canadiens ice hockey club, the oldest surviving professional hockey franchise in the world, is founded as a charter member of the National Hockey Association.
Day of death April 20, 1956
The temperature on April 20, 1956 was between -0.8 °C and 8.3 °C and averaged 4.6 °C. There was 0.1 mm of rain. There was 2.8 hours of sunshine (20%). The partly or heavily clouded was. The average windspeed was 3 Bft (moderate breeze) and was prevailing from the northwest. Source: KNMI
May 1 » A doctor in Japan reports an "epidemic of an unknown disease of the central nervous system", marking the official discovery of Minamata disease.
May 20 » In Operation Redwing, the first United States airborne hydrogen bomb is dropped over Bikini Atoll in the Pacific Ocean.
October 17 » Bobby Fischer defeats Donald Byrne in the chess Game of the Century.
October 28 » Hungarian Revolution: A de facto ceasefire comes into effect between armed revolutionaries and Soviet troops, who begin to withdraw from Budapest. Communist officials and facilities come under attack by revolutionaries.
October 31 » Suez Crisis: The United Kingdom and France begin bombing Egypt to force the reopening of the Suez Canal.
November 5 » Suez Crisis: British and French paratroopers land in Egypt after a week-long bombing campaign.
When copying data from this family tree, please include a reference to the origin: Gijsbertus Cornelis (Bert) Severijn, "Family tree Severijn", database, Genealogy Online (https://www.genealogieonline.nl/stamboom-severijn/I18156.php : accessed February 22, 2026), "Wilhelmina Clasina Sanders (1884-1956)".
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