The temperature on July 28, 1910 was between 9.9 °C and 22.0 °C and averaged 16.7 °C. There was 5.6 hours of sunshine (36%). The average windspeed was 3 Bft (moderate breeze) and was prevailing from the south east. 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.
January 15 » Construction ends on the Buffalo Bill Dam in Wyoming, United States, which was the highest dam in the world at the time, at 325ft (99m).
May 6 » George V becomes King of Great Britain, Ireland, and many overseas territories, on the death of his father, Edward VII.
June 25 » Igor Stravinsky's ballet The Firebird is premiered in Paris, bringing him to prominence as a composer.
November 23 » Johan Alfred Ander becomes the last person to be executed in Sweden.
December 3 » Modern neon lighting is first demonstrated by Georges Claude at the Paris Motor Show.
Day of marriage April 15, 1939
The temperature on April 15, 1939 was between 8.9 °C and 13.5 °C and averaged 10.7 °C. There was 1.7 hours of sunshine (12%). The average windspeed was 4 Bft (moderate breeze) and was prevailing from the west-southwest. Source: KNMI
In The Netherlands , there was from June 24, 1937 to July 25, 1939 the cabinet Colijn IV, with Dr. H. Colijn (ARP) as prime minister.
In The Netherlands , there was from July 25, 1939 to August 10, 1939 the cabinet Colijn V, with Dr. H. Colijn (ARP) as prime minister.
In The Netherlands , there was from August 10, 1939 to September 3, 1940 the cabinet De Geer II, with Jonkheer mr. D.J. de Geer (CHU) as prime minister.
August 27 » First flight of the turbojet-powered Heinkel He 178, the world's first jet aircraft.
September 1 » World War II: Nazi Germany and Slovakia invade Poland, beginning the European phase of World War II.
September 18 » World War II: The Polish government of Ignacy Mościcki flees to Romania.
September 19 » World War II: The Battle of Kępa Oksywska concludes, with Polish losses reaching roughly 14% of all the forces engaged.
October 14 » World War II: The German submarineU-47 sinks the British battleship HMSRoyal Oak within her harbour at Scapa Flow, Scotland.
November 26 » Shelling of Mainila: The Soviet Army orchestrates an incident which is used to justify the start of the Winter War with Finland four days later.
Day of death August 5, 1968
The temperature on August 5, 1968 was between 16.3 °C and 25.5 °C and averaged 19.9 °C. There was 1.1 mm of rain during 1.3 hours. There was 5.3 hours of sunshine (35%). The partly or heavily clouded was. The average windspeed was 2 Bft (weak wind) and was prevailing from the east. Source: KNMI
January 22 » Operation Igloo White, a US electronic surveillance system to stop communist infiltration into South Vietnam begins installation.
June 5 » Presidential candidate Robert F. Kennedy is assassinated by Sirhan Sirhan.
June 9 » U.S. President Lyndon B. Johnson declares a national day of mourning following the assassination of Senator Robert F. Kennedy.
July 23 » Glenville shootout: In Cleveland, Ohio, a violent shootout between a Black Militant organization and the Cleveland Police Department occurs. During the shootout, a riot begins and lasts for five days.
September 30 » The Boeing 747 is rolled out and shown to the public for the first time.
October 2 » Mexican President Gustavo Díaz Ordaz orders soldiers to suppress a demonstration of unarmed students, ten days before the start of the 1968 Summer Olympics.
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/I731.php : accessed February 23, 2026), "Josephus Johannes Opperman (1910-1968)".
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