The temperature on April 20, 1917 was between 4.1 °C and 10.4 °C and averaged 6.4 °C. There was 1.7 hours of sunshine (12%). The average windspeed was 4 Bft (moderate breeze) and was prevailing from the northwest. 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.
March 8 » International Women's Day protests in St. Petersburg mark the beginning of the February Revolution (February 23rd in the Julian calendar).
July 27 » World War I: The Allies reach the Yser Canal at the Battle of Passchendaele.
October 13 » The "Miracle of the Sun" is witnessed by an estimated 70,000 people in the Cova da Iria in Portugal.
November 20 » World War I: Battle of Cambrai begins: British forces make early progress in an attack on German positions but are later pushed back.
November 26 » The Manchester Guardian publishes the 1916 secret Sykes-Picot Agreement between the United Kingdom and France.
November 26 » The National Hockey League is formed, with the Montreal Canadiens, Montreal Wanderers, Ottawa Senators, Quebec Bulldogs, and Toronto Arenas as its first teams.
Day of death April 4, 1980
The temperature on April 4, 1980 was between 3.1 °C and 8.4 °C and averaged 5.3 °C. There was -0.1 mm of rain. There was 6.3 hours of sunshine (48%). The partly clouded was. The average windspeed was 3 Bft (moderate breeze) and was prevailing from the north. 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 27 » Through cooperation between the U.S. and Canadian governments, six American diplomats secretly escape hostilities in Iran in the culmination of the Canadian Caper.
April 2 » United States President Jimmy Carter signs the Crude Oil Windfall Profits Tax Act.
June 1 » Cable News Network (CNN) begins broadcasting.
July 5 » Swedish tennis player Björn Borg wins his fifth Wimbledon final and becomes the first male tennis player to win the championships five times in a row (1976–1980).
August 25 » Zimbabwe joins the United Nations.
December 24 » Witnesses report the first of several sightings of unexplained lights near RAF Woodbridge, in Rendlesham Forest, Suffolk, England, United Kingdom, an incident called "Britain's Roswell".
When copying data from this family tree, please include a reference to the origin: Hans Groothelm, "Family tree Groothelm", database, Genealogy Online (https://www.genealogieonline.nl/stamboom-groothelm/I44.php : accessed January 12, 2026), "Johannes Groothelm (1917-1980)".
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