The temperature on January 21, 1915 was between 0.9 °C and 4.4 °C and averaged 3.2 °C. There was 9.6 mm of rain. The average windspeed was 5 Bft (very strong wind) and was prevailing from the south. Source: KNMI
In The Netherlands , there was from August 29, 1913 to September 9, 1918 the cabinet Cort van der Linden, with Mr. P.W.A. Cort van der Linden (liberaal) as prime minister.
January 13 » The 6.7 Mw Avezzano earthquake shakes the Province of L'Aquila in Italy with a maximum Mercalli intensity of XI (Extreme), killing between 29,978–32,610.
May 7 » The Republic of China accedes to 13 of the 21 Demands, extending the Empire of Japan's control over Manchuria and the Chinese economy.
May 24 » World War I: Italy declares war on Austria-Hungary, joining the conflict on the side of the Allies.
July 1 » Leutnant Kurt Wintgens of the then-named German Deutsches Heer's Fliegertruppe army air service achieves the first known aerial victory with a synchronized machine-gun armed fighter plane, the Fokker M.5K/MG Eindecker.
July 28 » The United States begins a 19-year occupation of Haiti.
November 25 » Albert Einstein presents the field equations of general relativity to the Prussian Academy of Sciences.
Day of marriage September 19, 1936
The temperature on September 19, 1936 was between 10.1 °C and 19.8 °C and averaged 13.9 °C. There was 3.3 hours of sunshine (26%). The average windspeed was 2 Bft (weak wind) and was prevailing from the south east. Source: KNMI
April 5 » Tupelo–Gainesville tornado outbreak: An F5 tornado kills 233 in Tupelo, Mississippi.
April 15 » First day of the Arab revolt in Mandatory Palestine.
May 28 » Alan Turing submits On Computable Numbers for publication.
June 26 » Initial flight of the Focke-Wulf Fw 61, the first practical helicopter.
July 18 » On the Spanish mainland, a faction of the army supported by fascists, rises up against the Second Spanish Republic in a coup d'état starting the 3-year-long Civil War, resulting in the longest dictatorship in modern European history.
September 6 » Spanish Civil War: The Interprovincial Council of Asturias and León is established.
Day of death April 13, 1987
The temperature on April 13, 1987 was between 2.9 °C and 10.7 °C and averaged 7.8 °C. There was -0.1 mm of rain. There was 3.4 hours of sunshine (25%). The heavily clouded was. The average windspeed was 2 Bft (weak wind) and was prevailing from the west. Source: KNMI
In The Netherlands , there was from Tuesday, November 4, 1986 to Tuesday, November 7, 1989 the cabinet Lubbers II, with Drs. R.F.M. Lubbers (CDA) as prime minister.
July 1 » The American radio station WFAN in New York City is launched as the world's first all-sports radio station.
July 29 » Prime Minister of India Rajiv Gandhi and President of Sri Lanka J. R. Jayewardene sign the Indo-Sri Lanka Accord on ethnic issues.
August 4 » The Federal Communications Commission rescinds the Fairness Doctrine which had required radio and television stations to present controversial issues "fairly".
September 3 » In a coup d'état in Burundi, President Jean-Baptiste Bagaza is deposed by Major Pierre Buyoya.
November 1 » British Rail Class 43 (HST) hits the record speed of 238km/h for rail vehicles with on-board fuel to generate electricity for traction motors.
December 8 » Cold War: The Intermediate-Range Nuclear Forces Treaty is signed by U.S. President Ronald Reagan and Soviet leader Mikhail Gorbachev in the White House.
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/I1650.php : accessed February 27, 2026), "Johannes Jakobus Knoop (1915-1987)".
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