The temperature on April 11, 1912 was between 0.1 °C and 9.1 °C and averaged 3.4 °C. There was 1.3 mm of rain. There was 7.8 hours of sunshine (57%). The average windspeed was 4 Bft (moderate breeze) and was prevailing from the west-northwest. Source: KNMI
January 5 » The 6th All-Russian Conference of the Russian Social Democratic Labour Party (Prague Party Conference) opens. In the course of the conference, Vladimir Lenin and his supporters break from the rest of the party to form the Bolshevik movement.
February 14 » Arizona is admitted as the 48th and the last contiguous U.S. state.
August 6 » The Bull Moose Party meets at the Chicago Coliseum.
October 3 » U.S. forces defeat Nicaraguan rebels at the Battle of Coyotepe Hill.
December 3 » Bulgaria, Greece, Montenegro, and Serbia (the Balkan League) sign an armistice with the Ottoman Empire, temporarily halting the First Balkan War. (The armistice will expire on February 3, 1913, and hostilities will resume.)
December 8 » Leaders of the German Empire hold an Imperial War Council to discuss the possibility that war might break out.
Day of marriage November 19, 1936
The temperature on November 19, 1936 was between 0.6 °C and 5.9 °C and averaged 4.1 °C. The average windspeed was 4 Bft (moderate breeze) and was prevailing from the east-northeast. Source: KNMI
May 21 » Sada Abe is arrested after wandering the streets of Tokyo for days with her dead lover's severed genitals in her handbag. Her story soon becomes one of Japan's most notorious scandals.
July 23 » In Catalonia, Spain, the Unified Socialist Party of Catalonia is founded through the merger of Socialist and Communist parties.
August 19 » The Great Purge of the Soviet Union begins when the first of the Moscow Trials is convened.
September 6 » Spanish Civil War: The Interprovincial Council of Asturias and León is established.
October 27 » Mrs Wallis Simpson obtains her divorce, which would eventually allow her to marry King Edward VIII of the United Kingdom, thus forcing his abdication from the throne.
December 11 » Abdication Crisis: Edward VIII's abdication as King of the United Kingdom and the British Dominions beyond the Seas, and Emperor of India, becomes effective.
Day of death August 15, 1971
The temperature on August 15, 1971 was between 12.5 °C and 18.6 °C and averaged 15.5 °C. There was 2.2 mm of rain during 1.1 hours. There was 0.8 hours of sunshine (5%). The partly or heavily clouded was. The average windspeed was 2 Bft (weak wind) and was prevailing from the west-southwest. Source: KNMI
When copying data from this family tree, please include a reference to the origin: Tjitze Koster, "Family tree Koster Twijslerheide e.o.", database, Genealogy Online (https://www.genealogieonline.nl/stamboom-koster/I4908.php : accessed March 16, 2026), "Sjoerd Postma (1912-1971)".
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