June 20 » The Kiel Canal, crossing the base of the Jutland peninsula and the busiest artificial waterway in the world, is officially opened.
August 31 » German Count Ferdinand von Zeppelin patents his navigable balloon.
October 21 » The Republic of Formosa collapses as Japanese forces invade.
November 8 » While experimenting with electricity, Wilhelm Röntgen discovers the X-ray.
December 28 » Wilhelm Röntgen publishes a paper detailing his discovery of a new type of radiation, which later will be known as x-rays.
Day of marriage October 23, 1915
The temperature on October 23, 1915 was between -0.8 °C and 11.1 °C and averaged 5.9 °C. There was 0.1 mm of rain. There was 3.7 hours of sunshine (36%). The average windspeed was 2 Bft (weak wind) and was prevailing from the south east. Source: KNMI
In The Netherlands , there was from August 29, 1913 to September 9, 1918 the cabinet Cort van der Linden, with Mr. P.W.A. Cort van der Linden (liberaal) as prime minister.
January 13 » The 6.7 Mw Avezzano earthquake shakes the Province of L'Aquila in Italy with a maximum Mercalli intensity of XI (Extreme), killing between 29,978–32,610.
March 20 » Albert Einstein publishes his general theory of relativity.
April 22 » The use of poison gas in World War I escalates when chlorine gas is released as a chemical weapon in the Second Battle of Ypres.
June 9 » William Jennings Bryan resigns as Woodrow Wilson's Secretary of State over a disagreement regarding the United States' handling of the sinking of the RMSLusitania.
October 14 » World War I: Bulgaria joins the Central Powers.
November 25 » Albert Einstein presents the field equations of general relativity to the Prussian Academy of Sciences.
Day of death April 10, 1961
The temperature on April 10, 1961 was between 4.7 °C and 16.1 °C and averaged 9.9 °C. There was 11.2 hours of sunshine (83%). The average windspeed was 2 Bft (weak wind) and was prevailing from the northeast. Source: KNMI
January 20 » John F. Kennedy is inaugurated the 35th President of the United States of America, becoming the second youngest man to take the office, and the first Catholic.
April 12 » Cold War: Space Race: The Soviet cosmonaut Yuri Gagarin becomes the first human to travel into outer space and perform the first manned orbital flight, Vostok 1.
May 24 » American civil rights movement: Freedom Riders are arrested in Jackson, Mississippi, for "disturbing the peace" after disembarking from their bus.
July 23 » The Sandinista National Liberation Front is founded in Nicaragua.
October 30 » The Soviet Union detonates the Tsar Bomba, the most powerful explosive device ever detonated.
December 31 » RTÉ, Ireland's state broadcaster, launches its first national television service.
When copying data from this family tree, please include a reference to the origin: Hans Weening, "Family tree Weening", database, Genealogy Online (https://www.genealogieonline.nl/stamboom-weening/I197009.php : accessed October 24, 2026), "Sytske Vaartjes (1895-1961)".
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