February 11 » Anton Bruckner's 9th Symphony receives its first performance in Vienna, Austria.
February 23 » Cuba leases Guantánamo Bay to the United States "in perpetuity".
August 2 » The Ilinden–Preobrazhenie Uprising against the Ottoman Empire begins.
September 11 » The first race at the Milwaukee Mile in West Allis, Wisconsin is held. It is the oldest major speedway in the world.
November 3 » With the encouragement of the United States, Panama separates from Colombia.
November 17 » The Russian Social Democratic Labour Party splits into two groups: The Bolsheviks (Russian for "majority") and Mensheviks (Russian for "minority").
Day of death August 11, 1961
The temperature on August 11, 1961 was between 10.8 °C and 20.6 °C and averaged 16.4 °C. There was 2.0 mm of rain during 0.5 hours. There was 6.8 hours of sunshine (45%). The partly clouded was. The average windspeed was 2 Bft (weak wind) and was prevailing from the west-southwest. Source: KNMI
January 8 » In France a referendum supports Charles de Gaulle's policies in Algeria.
January 17 » Former Congolese Prime Minister Patrice Lumumba is murdered in circumstances suggesting the support and complicity of the governments of Belgium and the United States.
February 14 » Discovery of the chemical elements: Element 103, Lawrencium, is first synthesized at the University of California.
September 16 » Pakistan establishes its Space and Upper Atmosphere Research Commission with Abdus Salam as its head.
September 17 » The world's first retractable roof stadium, the Civic Arena, opens in Pittsburgh, Pennsylvania.
December 19 » India annexes Daman and Diu, part of Portuguese India.
When copying data from this family tree, please include a reference to the origin: J Eijsermans, "Eijsermans family tree", database, Genealogy Online (https://www.genealogieonline.nl/stamboom-eijsermans/I325458.php : accessed February 18, 2026), "Johanna Petronella van Zon (1903-1961)".
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