The temperature on April 15, 1910 was between 6.7 °C and 15.6 °C and averaged 11.4 °C. There was 1.2 mm of rain. There was 8.4 hours of sunshine (61%). The average windspeed was 4 Bft (moderate breeze) and was prevailing from the south. Source: KNMI
January 13 » The first public radio broadcast takes place; a live performance of the operas Cavalleria rusticana and Pagliacci are sent out over the airwaves from the Metropolitan Opera House in New York.
May 4 » The Royal Canadian Navy is created.
June 17 » Aurel Vlaicu pilots an A. Vlaicu nr. 1 on its first flight.
October 5 » In a revolution in Portugal the monarchy is overthrown and a republic is declared.
October 6 » Eleftherios Venizelos is elected prime minister of Greece for the first of seven times.
November 20 » Mexican Revolution: Francisco I. Madero issues the Plan de San Luis Potosí, denouncing Mexican President Porfirio Díaz, calling for a revolution to overthrow the government of Mexico, effectively starting the Mexican Revolution.
Day of death May 9, 1981
The temperature on May 9, 1981 was between 11.0 °C and 23.1 °C and averaged 17.3 °C. There was 4.2 mm of rain during 0.7 hours. There was 7.5 hours of sunshine (49%). The partly or heavily clouded was. The average windspeed was 2 Bft (weak wind) and was prevailing from the east. 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.
In The Netherlands , there was from Friday, September 11, 1981 to Saturday, May 29, 1982 the cabinet Van Agt II, with Mr. A.A.M. van Agt (CDA) as prime minister.
April 3 » The Osborne 1, the first successful portable computer, is unveiled at the West Coast Computer Faire in San Francisco.
May 21 » The Italian government releases the membership list of Propaganda Due, an illegal pseudo-Masonic lodge that was implicated in numerous Italian crimes and mysteries.
July 30 » As many as 50,000 demonstrators, mostly women and children, took to the streets in Łódź to protest food ration shortages in Communist Poland.
August 7 » The Washington Star ceases all operations after 128 years of publication.
October 14 » Vice President Hosni Mubarak is elected as the President of Egypt, one week after the assassination of Anwar Sadat.
November 25 » Pope John Paul II appoints Joseph Cardinal Ratzinger (the future Pope Benedict XVI) Prefect of the Congregation for the Doctrine of the Faith.
When copying data from this family tree, please include a reference to the origin: Rik Plomp, "Pedigree Plomp", database, Genealogy Online (https://www.genealogieonline.nl/stamboom-plomp/I2559.php : accessed January 6, 2026), "Maria van Kerkvoorde (1910-1981)".
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