March 6 » Bayer registers "Aspirin" as a trademark.
July 17 » NEC Corporation is organized as the first Japanese joint venture with foreign capital.
September 13 » Henry Bliss is the first person in the United States to be killed in an automobile accident.
November 28 » The Second Boer War: a British column is engaged by Boer forces at the Battle of Modder River; although the Boers withdraw, the British suffer heavy casualties.
December 2 » Philippine–American War: The Battle of Tirad Pass, termed "The Filipino Thermopylae", is fought.
December 11 » Second Boer War: In the Battle of Magersfontein the Boers commanded by general Piet Cronjé inflict a defeat on the forces of the British Empire commanded by Lord Methuen trying to relieve the Siege of Kimberley.
Day of death June 15, 1980
The temperature on June 15, 1980 was between 12.3 °C and 22.1 °C and averaged 16.6 °C. There was 4.7 mm of rain during 0.5 hours. There was 6.3 hours of sunshine (38%). The partly clouded was. The average windspeed was 2 Bft (weak wind) and was prevailing from the 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.
May 8 » The World Health Organization confirms the eradication of smallpox.
May 17 » On the eve of presidential elections, Maoist guerrilla group Shining Path attacks a polling location in Chuschi (a town in Ayacucho), starting the Internal conflict in Peru.
June 3 » The 1980 Grand Island tornado outbreak hits Nebraska, causing five deaths and $300million (equivalent to $931million in 2019) worth of damage.
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.
October 29 » Demonstration flight of a secretly modified C-130 for an Iran hostage crisis rescue attempt ends in crash landing at Eglin Air Force Base's Duke Field, Florida leading to cancellation of Operation Credible Sport.
November 12 » The NASA space probe Voyager I makes its closest approach to Saturn and takes the first images of its rings.
When copying data from this family tree, please include a reference to the origin: Dirk Kalksma, "Family tree Kalksma", database, Genealogy Online (https://www.genealogieonline.nl/stamboom-kalksma/I712.php : accessed January 21, 2026), "Siemon Visser (1899-1980)".
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