January 31 » Czechoslav Trade Union Association is founded in Prague.
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.
July 2 » British-Italian engineer Guglielmo Marconi obtains a patent for radio in London.
July 11 » Salomon August Andrée leaves Spitsbergen to attempt to reach the North Pole by balloon. He later crashes and dies.
August 2 » Anglo-Afghan War: The Siege of Malakand ends when a relief column is able to reach the British garrison in the Malakand states.
August 10 » German chemist Felix Hoffmann discovers an improved way of synthesizing acetylsalicylic acid (aspirin).
Day of marriage July 21, 1921
The temperature on July 21, 1921 was between 8.2 °C and 22.1 °C and averaged 16.3 °C. There was 9.9 hours of sunshine (62%). The average windspeed was 3 Bft (moderate breeze) and was prevailing from the northwest. Source: KNMI
In The Netherlands , there was from September 9, 1918 to September 18, 1922 the cabinet Ruys de Beerenbrouck I, with Jonkheer mr. Ch.J.M. Ruys de Beerenbrouck (RKSP) as prime minister.
January 20 » The first Constitution of Turkey is adopted, making fundamental changes in the source and exercise of sovereignty by consecrating the principle of national sovereignty.
March 6 » Portuguese Communist Party is founded as the Portuguese Section of the Communist International.
April 11 » Emir Abdullah establishes the first centralised government in the newly created British protectorate of Transjordan.
July 11 » The Red Army captures Mongolia from the White Army and establishes the Mongolian People's Republic.
July 23 » The Communist Party of China (CPC) is established at the founding National Congress.
August 28 » The Red Army dissolved the Free Territory, after driving the Black Army out of Ukraine.
Day of death April 18, 1980
The temperature on April 18, 1980 was between 3.9 °C and 9.6 °C and averaged 7.5 °C. There was 1.5 mm of rain during 9.1 hours. The heavily clouded was. The average windspeed was 2 Bft (weak wind) and was prevailing from the west. 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.
May 18 » Students in Gwangju, South Korea begin demonstrations calling for democratic reforms.
July 7 » Institution of sharia law in Iran.
August 1 » Vigdís Finnbogadóttir is elected President of Iceland and becomes the world's first democratically elected female head of state.
October 10 » The Farabundo Martí National Liberation Front is founded in El Salvador.
October 17 » As part of the Holy See–United Kingdom relations a British monarch makes the first state visit to the Vatican.
November 21 » A deadly fire breaks out at the MGM Grand Hotel in Paradise, Nevada (now Bally's Las Vegas). Eighty-seven people are killed and more than 650 are injured in the worst disaster in Nevada history.
When copying data from this family tree, please include a reference to the origin: Klaas Boerstra, "Family tree Boerstra", database, Genealogy Online (https://www.genealogieonline.nl/stamboom-boerstra/I8167.php : accessed January 25, 2026), "Froukjen Spaan (1897-1980)".
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