January 6 » Second Boer War: Having already besieged the fortress at Ladysmith, Boer forces attack it, but are driven back by British defenders.
February 7 » Second Boer War: British troops fail in their third attempt to lift the Siege of Ladysmith.
February 28 » The Second Boer War: The 118-day "Siege of Ladysmith" is lifted.
May 1 » The Scofield Mine disaster kills over 200 men in Scofield, Utah in what is to date the fifth-worst mining accident in United States history.
September 17 » Philippine–American War: Filipinos under Juan Cailles defeat Americans under Colonel Benjamin F. Cheatham Jr. at Mabitac.
December 14 » Quantum mechanics: Max Planck presents a theoretical derivation of his black-body radiation law.
Day of death August 12, 1980
The temperature on August 12, 1980 was between 13.7 °C and 17.7 °C and averaged 15.5 °C. There was 9.6 mm of rain during 3.1 hours. There was 3.3 hours of sunshine (22%). The heavily clouded was. The average windspeed was 3 Bft (moderate breeze) and was prevailing from the west-southwest. Source: KNMI
In The Netherlands , there was from Monday, December 19, 1977 to Friday, September 11, 1981 the cabinet Van Agt I, with Mr. A.A.M. van Agt (CDA/KVP) as prime minister.
January 28 » USCGCBlackthorn collides with the tanker Capricorn while leaving Tampa, Florida and capsizes, killing 23 Coast Guard crewmembers.
January 29 » The Rubik's Cube makes its international debut at the Ideal Toy Corp. in Earl's Court, London.
February 26 » Egypt and Israel establish full diplomatic relations.
July 7 » During the Lebanese Civil War, 83 Tiger militants are killed during what will be known as the Safra massacre.
July 24 » The Quietly Confident Quartet of Australia wins the men's 4 x 100 metre medley relay at the Moscow Olympics, the only time the United States has not won the event at Olympic level.
December 2 » Salvadoran Civil War: Four American missionaries are raped and murdered by a death squad.
When copying data from this family tree, please include a reference to the origin: Hendrik de Graaf, "Family tree Plugboer", database, Genealogy Online (https://www.genealogieonline.nl/stamboom-plugboer/I6138.php : accessed February 23, 2026), "Geertrui Leendertsen (1900-1980)".
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