The temperature on December 11, 1912 was between 6.1 °C and 8.7 °C and averaged 7.3 °C. There was 0.5 mm of rain. The average windspeed was 4 Bft (moderate breeze) and was prevailing from the south-southwest. Source: KNMI
January 6 » German geophysicist Alfred Wegener first presents his theory of continental drift.
February 14 » Arizona is admitted as the 48th and the last contiguous U.S. state.
April 14 » The British passenger liner RMSTitanic hits an iceberg in the North Atlantic at 23:40 (sinks morning of April 15th).
May 5 » Pravda, the "voice" of the Communist Party of the Soviet Union, begins publication in Saint Petersburg.
May 13 » The Royal Flying Corps, the forerunner of the Royal Air Force, is established in the United Kingdom.
October 11 » First Balkan War: The day after the Battle of Sarantaporo, Greek troops liberate the city of Kozani.
Day of marriage November 8, 1935
The temperature on November 8, 1935 was between 5.2 °C and 10.9 °C and averaged 7.8 °C. There was 0.2 mm of rain during 0.4 hours. There was 5.9 hours of sunshine (64%). The average windspeed was 5 Bft (very strong wind) and was prevailing from the south. Source: KNMI
February 20 » Caroline Mikkelsen becomes the first woman to set foot in Antarctica.
February 26 » Robert Watson-Watt carries out a demonstration near Daventry which leads directly to the development of radar in the United Kingdom.
February 28 » DuPont scientist Wallace Carothers invents nylon.
June 11 » Inventor Edwin Armstrong gives the first public demonstration of FM broadcasting in the United States at Alpine, New Jersey.
October 3 » Second Italo-Abyssinian War: Italy invades Ethiopia.
December 5 » Mary McLeod Bethune founds the National Council of Negro Women in New York City.
Day of death April 30, 1975
The temperature on April 30, 1975 was between 4.5 °C and 13.6 °C and averaged 9.2 °C. There was 3.6 mm of rain during 4.6 hours. There was 9.4 hours of sunshine (63%). The partly 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 Friday, May 11, 1973 to Monday, December 19, 1977 the cabinet Den Uyl, with Drs. J.M. den Uyl (PvdA) as prime minister.
January 30 » The Monitor National Marine Sanctuary is established as the first United States National Marine Sanctuary.
March 6 » Algiers Accord: Iran and Iraq announce a settlement of their border dispute.
April 21 » Vietnam War: President of South Vietnam Nguyễn Văn Thiệu flees Saigon, as Xuân Lộc, the last South Vietnamese outpost blocking a direct North Vietnamese assault on Saigon, falls.
June 5 » The United Kingdom holds its first country-wide referendum on membership of the European Economic Community (EEC).
July 5 » Arthur Ashe becomes the first black man to win the Wimbledon singles title.
August 27 » The Governor of Portuguese Timor abandons its capital, Dili, and flees to Atauro Island, leaving control to a rebel group.
When copying data from this family tree, please include a reference to the origin: Joop Klavers, "Family tree Klavers", database, Genealogy Online (https://www.genealogieonline.nl/stamboom_klavers/I32508.php : accessed February 26, 2026), "Jacobus "Koos" Wisse (1912-1975)".
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