The temperature on April 6, 1915 was between 3.7 °C and 11.3 °C and averaged 7.2 °C. There was 2.0 mm of rain. There was 5.1 hours of sunshine (38%). The average windspeed was 4 Bft (moderate breeze) and was prevailing from the south-southwest. 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 20 » Albert Einstein publishes his general theory of relativity.
April 18 » French pilot Roland Garros is shot down and glides to a landing on the German side of the lines during World War I.
May 7 » World War I: German submarine U-20 sinks RMS Lusitania, killing 1,198 people, including 128 Americans. Public reaction to the sinking turns many former pro-Germans in the United States against the German Empire.
June 5 » Denmark amends its constitution to allow women's suffrage.
August 17 » A Category 4 hurricane hits Galveston, Texas with winds at 135 miles per hour (217km/h).
November 25 » Albert Einstein presents the field equations of general relativity to the Prussian Academy of Sciences.
Day of death June 29, 1976
The temperature on June 29, 1976 was between 14.2 °C and 26.5 °C and averaged 20.5 °C. There was 15.8 hours of sunshine (95%). The almost cloudless was. The average windspeed was 3 Bft (moderate breeze) and was prevailing from the northeast. 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 3 » The International Covenant on Economic, Social and Cultural Rights, adopted by the United Nations General Assembly, comes into force.
January 5 » The Troubles: Gunmen shoot dead ten Protestant civilians after stopping their minibus at Kingsmill in County Armagh, Northern Ireland, UK, allegedly as retaliation for a string of attacks on Catholic civilians in the area by Loyalists, particularly the killing of six Catholics the night before.
March 24 » In Argentina, the armed forces overthrow the constitutional government of President Isabel Perón and start a 7-year dictatorial period self-styled the National Reorganization Process.
April 1 » Apple Inc. is formed by Steve Jobs, Steve Wozniak, and Ronald Wayne in Cupertino, California, USA.
July 28 » The Tangshan earthquake measuring between 7.8 and 8.2 moment magnitude flattens Tangshan in the People's Republic of China, killing 242,769 and injuring 164,851.
September 21 » Seychelles joins the United Nations.
When copying data from this family tree, please include a reference to the origin: Hendrik de Graaf, "Family tree Plugboer", database, Genealogy Online (https://www.genealogieonline.nl/stamboom-plugboer/I501941.php : accessed March 6, 2026), "Aagje Vroegop (1915-1976)".
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