March 18 » AFC Ajax Amsterdam, The Netherlands's biggest and most successful football club, was founded.
May 24 » Second Boer War: The United Kingdom annexes the Orange Free State.
May 29 » N'Djamena is founded as Fort-Lamy by the French commander Émile Gentil.
September 13 » Filipino insurgents defeat a small American column in the Battle of Pulang Lupa, during the Philippine–American War.
November 7 » The People's Party is founded in Cuba.
December 14 » Quantum mechanics: Max Planck presents a theoretical derivation of his black-body radiation law.
Day of death September 24, 1921
The temperature on September 24, 1921 was between 6.8 °C and 19.8 °C and averaged 13.9 °C. There was 0.1 mm of rain. The average windspeed was 2 Bft (weak wind) and was prevailing from the north-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.
February 12 » Bolsheviks launch a revolt in Georgia as a preliminary to the Red Army invasion of Georgia.
February 15 » Kingdom of Romania establishes its legation in Helsinki.
April 11 » Emir Abdullah establishes the first centralised government in the newly created British protectorate of Transjordan.
August 23 » British airship R-38 experiences structural failure over Hull in England and crashes in the Humber Estuary. Of her 49 British and American training crew, only four survive.
October 13 » Soviet republics sign the Treaty of Kars to formalize the borders between Turkey and the South Caucasus states.
December 6 » The Anglo-Irish Treaty is signed in London by British and Irish representatives.
When copying data from this family tree, please include a reference to the origin: Ruud Heemskerk, "Heemskerk door de eeuwen heen", database, Genealogy Online (https://www.genealogieonline.nl/heemskerk-door-de-eeuwen-heen/R512.php : accessed May 5, 2025), "Jacobus Hermanus Heemskerk (1900-1921)".
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