January 23 » The Malolos Constitution is inaugurated, establishing the First Philippine Republic. Emilio Aguinaldo is sworn in as its first President.
February 14 » Voting machines are approved by the U.S. Congress for use in federal elections.
March 6 » Bayer registers "Aspirin" as a trademark.
March 30 » German Society of Chemistry issues an invitation to other national scientific organizations to appoint delegates to the International Committee on Atomic Weights.
May 8 » The Irish Literary Theatre in Dublin produced its first play.
November 29 » FC Barcelona is founded by Catalan, Spanish and Englishmen. It later develops into one of Spanish football's most iconic and strongest teams.
Day of death April 12, 1971
The temperature on April 12, 1971 was between 0.9 °C and 12.0 °C and averaged 6.5 °C. There was -0.1 mm of rain. There was 6.2 hours of sunshine (45%). The partly clouded was. The average windspeed was 3 Bft (moderate breeze) and was prevailing from the north-northeast. Source: KNMI
February 8 » South Vietnamese ground troops launch an incursion into Laos to try to cut off the Ho Chi Minh trail and stop communist infiltration.
February 11 » Cold War: the Seabed Arms Control Treaty opened for signature outlawing nuclear weapons on the ocean floor in international waters.
May 20 » In the Chuknagar massacre, Pakistani forces massacre thousands, mostly Bengali Hindus.
October 28 » Prospero becomes the only British satellite to be launched by a British rocket.
November 6 » The United States Atomic Energy Commission tests the largest U.S. underground hydrogen bomb, code-named Cannikin, on Amchitka Island in the Aleutians.
November 28 » Wasfi al-Tal, Prime Minister of Jordan, is assassinated by the Black September unit of the Palestine Liberation Organization.
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/I78603.php : accessed October 18, 2026), "Herman Piersma (1899-1971)".
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