February 1 » Fountains Valley, Pretoria, the oldest nature reserve in Africa, is proclaimed by President Paul Kruger.
March 19 » Auguste and Louis Lumière record their first footage using their newly patented cinematograph.
August 31 » German Count Ferdinand von Zeppelin patents his navigable balloon.
September 3 » John Brallier becomes the first openly professional American football player, when he was paid US$10 by David Berry, to play for the Latrobe Athletic Association in a 12-0 win over the Jeanette Athletic Association.
September 18 » The Atlanta Exposition Speech on race relations is delivered by Booker T. Washington.
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 May 31, 1923
The temperature on May 31, 1923 was between 8.5 °C and 12.1 °C and averaged 10.1 °C. There was 0.8 mm of rain. The average windspeed was 4 Bft (moderate breeze) and was prevailing from the north-northeast. Source: KNMI
In The Netherlands , there was from September 19, 1922 to August 4, 1925 the cabinet Ruys de Beerenbrouck II, with Jonkheer mr. Ch.J.M. Ruys de Beerenbrouck (RKSP) as prime minister.
January 9 » Lithuanian residents of the Memel Territory rebel against the League of Nations' decision to leave the area as a mandated region under French control.
March 20 » The Arts Club of Chicago hosts the opening of Pablo Picasso's first United States showing, entitled Original Drawings by Pablo Picasso, becoming an early proponent of modern art in the United States.
May 26 » The first 24 Hours of Le Mans was held and has since been run annually in June.
August 16 » The United Kingdom gives the name "Ross Dependency" to part of its claimed Antarctic territory and makes the Governor-General of the Dominion of New Zealand its administrator.
September 29 » The British Mandate for Palestine takes effect, creating Mandatory Palestine.
October 13 » Ankara becomes the capital of Turkey.
Day of death March 21, 1934
The temperature on March 21, 1934 was between 3.0 °C and 6.9 °C and averaged 5.5 °C. There was 1.1 mm of rain during 1.7 hours. The average windspeed was 3 Bft (moderate breeze) and was prevailing from the southwest. Source: KNMI
January 26 » The Apollo Theater reopens in Harlem, New York City.
February 21 » Augusto Sandino is executed.
June 15 » The United States Great Smoky Mountains National Park is founded.
June 26 » United States President Franklin D. Roosevelt signs the Federal Credit Union Act, which establishes credit unions.
July 11 » Engelbert Zaschka of Germany flies his large human-powered aircraft, the Zaschka Human-Power Aircraft, about 20 meters at Berlin Tempelhof Airport without assisted take-off.
November 11 » The Shrine of Remembrance in Melbourne, Australia is opened.
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/I187929.php : accessed October 14, 2026), "Jan van der Ploeg (1895-1934)".
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