The temperature on September 10, 1904 was between 7.4 °C and 17.5 °C and averaged 12.7 °C. There was 3.5 hours of sunshine (27%). The average windspeed was 3 Bft (moderate breeze) and was prevailing from the west-southwest. Source: KNMI
January 8 » The Blackstone Library is dedicated, marking the beginning of the Chicago Public Library system.
February 7 » A fire begins in Baltimore, Maryland; it destroys over 1,500 buildings in 30 hours.
February 28 » S.L. Benfica is founded in Portugal.
April 30 » The Louisiana Purchase Exposition World's Fair opens in St. Louis, Missouri.
May 5 » Pitching against the Philadelphia Athletics at the Huntington Avenue Grounds, Cy Young of the Boston Americans throws the first perfect game in the modern era of baseball.
November 16 » English engineer John Ambrose Fleming receives a patent for the thermionic valve (vacuum tube).
Day of death November 29, 1968
The temperature on November 29, 1968 was between -0.3 °C and 6.6 °C and averaged 3.0 °C. There was 1.1 mm of rain during 4.5 hours. The almost completely overcast was. The average windspeed was 1 Bft (weak wind) and was prevailing from the north-northeast. Source: KNMI
March 6 » Three rebels are executed by Rhodesia, the first executions since UDI, prompting international condemnation.
March 28 » Brazilian high school student Edson Luís de Lima Souto is killed by military police at a protest for cheaper meals at a restaurant for low-income students.
March 31 » American President Lyndon B. Johnson speaks to the nation of "Steps to Limit the War in Vietnam" in a television address. At the conclusion of his speech, he announces: "I shall not seek, and I will not accept, the nomination of my party for another term as your President."
August 20 » Cold War: Warsaw Pact troops invade Czechoslovakia, crushing the Prague Spring. East German participation is limited to a few specialists due to memories of the recent war. Only Albania and Romania refuse to participate.
November 22 » The Beatles release The Beatles (known popularly as The White Album).
December 21 » Apollo program: Apollo 8 is launched from the Kennedy Space Center, placing its crew on a lunar trajectory for the first visit to another celestial body by humans.
Day of burial December 3, 1968
The temperature on December 3, 1968 was between 0.2 °C and 1.8 °C and averaged 1.2 °C. The almost completely overcast was. The average windspeed was 2 Bft (weak wind) and was prevailing from the south east. Source: KNMI
March 17 » As a result of nerve gas testing by the U.S. Army Chemical Corps in Skull Valley, Utah, over 6,000 sheep are found dead.
April 11 » Assassination attempt on Rudi Dutschke, leader of the German student movement.
June 5 » Presidential candidate Robert F. Kennedy is assassinated by Sirhan Sirhan.
August 1 » The coronation is held of Hassanal Bolkiah, the 29th Sultan of Brunei.
August 20 » Cold War: Warsaw Pact troops invade Czechoslovakia, crushing the Prague Spring. East German participation is limited to a few specialists due to memories of the recent war. Only Albania and Romania refuse to participate.
December 24 » Apollo program: The crew of Apollo 8 enters into orbit around the Moon, becoming the first humans to do so. They performed ten lunar orbits and broadcast live TV pictures.
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/I1624.php : accessed January 26, 2026), "Petrus Johannes Maas (1904-1968)".
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