January 31 » Czechoslav Trade Union Association is founded in Prague.
February 28 » Queen Ranavalona III, the last monarch of Madagascar, is deposed by a French military force.
April 18 » The Greco-Turkish War is declared between Greece and the Ottoman Empire.
April 30 » J. J. Thomson of the Cavendish Laboratory announces his discovery of the electron as a subatomic particle, over 1,800 times smaller than a proton (in the atomic nucleus), at a lecture at the Royal Institution in London.
August 10 » German chemist Felix Hoffmann discovers an improved way of synthesizing acetylsalicylic acid (aspirin).
December 6 » London becomes the world's first city to host licensed taxicabs.
Day of marriage July 21, 1943
The temperature on July 21, 1943 was between 16.0 °C and 22.9 °C and averaged 18.8 °C. There was 0.5 mm of rain during 0.3 hours. The average windspeed was 3 Bft (moderate breeze) and was prevailing from the northeast. Source: KNMI
In The Netherlands , there was from July 27, 1941 to February 23, 1945 the cabinet Gerbrandy II, with Prof. dr. P.S. Gerbrandy (ARP) as prime minister.
January 11 » The Republic of China agrees to the Sino-British New Equal Treaty and the Sino-American New Equal Treaty.
May 16 » The Holocaust: The Warsaw Ghetto Uprising ends.
June 25 » The Holocaust: Jews in the Częstochowa Ghetto in Poland stage an uprising against the Nazis.
October 5 » Ninety-eight American POWs are executed by Japanese forces on Wake Island.
October 17 » The Burma Railway (Burma–Thailand Railway) is completed.
December 8 » World War II: The German 117th Jäger Division destroys the monastery of Mega Spilaio in Greece and executes 22 monks and visitors as part of reprisals that culminated a few days later with the Massacre of Kalavryta.
Day of death December 26, 1979
The temperature on December 26, 1979 was between -1.0 °C and 0.1 °C and averaged -0.4 °C. There was -0.1 mm of rain. The almost completely overcast was. The average windspeed was 3 Bft (moderate breeze) and was prevailing from the south. 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 19 » The United States House of Representatives begins broadcasting its day-to-day business via the cable television network C-SPAN.
September 22 » A bright flash, resembling the detonation of a nuclear weapon, is observed near the Prince Edward Islands. Its cause is never determined.
October 17 » The Department of Education Organization Act creates the US Department of Education.
October 26 » Park Chung-hee, President of South Korea, is assassinated by Korean CIA head Kim Jae-gyu.
November 1 » In Bolivia, Colonel Alberto Natusch executes a bloody coup d'état against the constitutional government of Wálter Guevara.
November 20 » Grand Mosque seizure: About 200 Sunni Muslims revolt in Saudi Arabia at the site of the Kaaba in Mecca during the pilgrimage and take about 6000 hostages. The Saudi government receives help from Pakistani special forces to put down the uprising.
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/I346583.php : accessed February 21, 2026), "Geert Potgieter (1897-1979)".
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