In The Netherlands , there was from August 21, 1891 to May 9, 1894 the cabinet Van Tienhoven, with Mr. G. van Tienhoven (unie-liberaal) as prime minister.
January 15 » James Naismith publishes the rules of basketball.
June 30 » The Homestead Strike begins near Pittsburgh, Pennsylvania.
July 7 » The Katipunan is established, the discovery of which by Spanish authorities initiated the Philippine Revolution.
July 26 » Dadabhai Naoroji is elected as the first Indian Member of Parliament in Britain.
October 13 » Edward Emerson Barnard discovers first comet discovered by photographic means.
December 18 » Premiere performance of The Nutcracker by Pyotr Ilyich Tchaikovsky in Saint Petersburg, Russia.
Day of marriage May 1, 1920
The temperature on May 1, 1920 was between 3.3 °C and 16.7 °C and averaged 10.9 °C. There was 0.2 mm of rain. There was 4.9 hours of sunshine (33%). The average windspeed was 3 Bft (moderate breeze) and was prevailing from the south-southeast. 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.
January 19 » The American Civil Liberties Union (ACLU) is founded.
June 4 » Hungary loses 71% of its territory and 63% of its population when the Treaty of Trianon is signed in Paris.
August 16 » Polish–Soviet War: The Battle of Radzymin concludes; the Soviet Red Army is forced to turn away from Warsaw.
August 20 » The first commercial radio station, 8MK (now WWJ), begins operations in Detroit.
August 31 » Polish–Soviet War: A decisive Polish victory in the Battle of Komarów.
November 2 » In the United States, KDKA of Pittsburgh starts broadcasting as the first commercial radio station. The first broadcast is the result of the 1920 United States presidential election.
Day of death March 31, 1969
The temperature on March 31, 1969 was between 3.6 °C and 9.2 °C and averaged 6.8 °C. There was 9.3 mm of rain during 6.6 hours. The heavily clouded was. The average windspeed was 4 Bft (moderate breeze) and was prevailing from the west-southwest. Source: KNMI
January 17 » Black Panther Party members Bunchy Carter and John Huggins are killed during a meeting in Campbell Hall on the campus of UCLA.
March 3 » Apollo program: NASA launches Apollo 9 to test the lunar module.
April 5 » Vietnam War: Massive antiwar demonstrations occur in many U.S. cities.
April 17 » Sirhan Sirhan is convicted of assassinating Robert F. Kennedy.
August 12 » Violence erupts after the Apprentice Boys of Derry march in Derry, Northern Ireland, resulting in a three-day communal riot known as the Battle of the Bogside.
December 17 » Project Blue Book: The United States Air Force closes its study of UFOs.
When copying data from this family tree, please include a reference to the origin: Hans Opperman, "Family tree Opperman", database, Genealogy Online (https://www.genealogieonline.nl/stamboom-opperman/I3154.php : accessed March 5, 2026), "Klaas Hettinga (1892-1969)".
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