The temperature on February 26, 1915 was between -4.5 °C and 6.1 °C and averaged 0.3 °C. There was 9.1 hours of sunshine (86%). The average windspeed was 3 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.
February 12 » In Washington, D.C., the first stone of the Lincoln Memorial is put into place.
March 26 » The Vancouver Millionaires win the 1915 Stanley Cup Finals, the first championship played between the Pacific Coast Hockey Association and the National Hockey Association.
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 22 » Lassen Peak erupts with a powerful force, the only volcano besides Mount St. Helens to erupt in the contiguous U.S. during the 20th century.
August 15 » A story in New York World newspaper reveals that the Imperial German government had purchased excess phenol from Thomas Edison that could be used to make explosives for the war effort and diverted it to Bayer for aspirin production.
October 12 » World War I: British nurse Edith Cavell is executed by a German firing squad for helping Allied soldiers escape from Belgium
Day of marriage April 13, 1944
The temperature on April 13, 1944 was between 5.1 °C and 21.5 °C and averaged 13.5 °C. There was 2.2 mm of rain during 0.9 hours. There was 9.3 hours of sunshine (68%). The average windspeed was 3 Bft (moderate breeze) and was prevailing from the east-southeast. Source: KNMI
In The Netherlands , there was from July 27, 1941 to February 23, 1945 the cabinet Gerbrandy II, with Prof. dr. P.S. Gerbrandy (ARP) as prime minister.
June 9 » World War II: The Soviet Union invades East Karelia and the previously Finnish part of Karelia, occupied by Finland since 1941.
June 13 » World War II: The Battle of Villers-Bocage: German tank ace Michael Wittmann ambushes elements of the British 7th Armoured Division, destroying up to fourteen tanks, fifteen personnel carriers and two anti-tank guns in a Tiger I tank.
August 12 » Alençon is liberated by General Philippe Leclerc de Hauteclocque, the first city in France to be liberated from the Nazis by French forces.
August 21 » Dumbarton Oaks Conference, prelude to the United Nations, begins.
September 8 » World War II: London is hit by a V-2 rocket for the first time.
October 15 » World War II: Germany replaces the Hungarian government after it announces an armistice with the Soviet Union.
Day of death June 29, 1969
The temperature on June 29, 1969 was between 7.9 °C and 20.4 °C and averaged 15.2 °C. There was 0.7 hours of sunshine (4%). The partly or heavily clouded was. The average windspeed was 2 Bft (weak wind) and was prevailing from the west. Source: KNMI
January 18 » United Airlines Flight 266 crashes into Santa Monica Bay killing all 32 passengers and six crew members.
April 22 » The formation of the Communist Party of India (Marxist-Leninist) is announced at a mass rally in Calcutta.
April 28 » Charles de Gaulle resigns as President of France.
July 20 » Apollo program: Apollo 11's crew successfully makes the first manned landing on the Moon in the Sea of Tranquility. Americans Neil Armstrong and Buzz Aldrin become the first humans to walk on the Moon six and a half hours later.
October 9 » In Chicago, the National Guard is called in as demonstrations continue over the trial of the "Chicago Eight".
November 21 » The first permanent ARPANET link is established between UCLA and SRI.
When copying data from this family tree, please include a reference to the origin: Hans Opperman, "Family tree Opperman", database, Genealogy Online (https://www.genealogieonline.nl/stamboom-opperman/I3220.php : accessed January 29, 2026), "Margaretha Johanna "Griet" Hettinga (1915-1969)".
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