The temperature on February 14, 1911 was between -3.9 °C and -1.4 °C and averaged -2.2 °C. The average windspeed was 2 Bft (weak wind) and was prevailing from the south. Source: KNMI
January 26 » Glenn Curtiss flies the first successful American seaplane.
July 4 » A massive heat wave strikes the northeastern United States, killing 380 people in eleven days and breaking temperature records in several cities.
July 24 » Hiram Bingham III re-discovers Machu Picchu, "the Lost City of the Incas".
August 24 » Manuel de Arriaga is elected and sworn-in as the first President of Portugal.
September 23 » Pilot Earle Ovington makes the first official airmail delivery in America under the authority of the United States Post Office Department
December 14 » Roald Amundsen's team, comprising himself, Olav Bjaaland, Helmer Hanssen, Sverre Hassel, and Oscar Wisting, becomes the first to reach the South Pole.
Day of death August 23, 1969
The temperature on August 23, 1969 was between 9.2 °C and 17.6 °C and averaged 12.8 °C. There was 8.4 mm of rain during 5.1 hours. There was 4.6 hours of sunshine (32%). The partly or heavily clouded was. The average windspeed was 2 Bft (weak wind) and was prevailing from the west-southwest. Source: KNMI
April 3 » Vietnam War: United States Secretary of Defense Melvin Laird announces that the United States will start to "Vietnamize" the war effort.
April 4 » Dr. Denton Cooley implants the first temporary artificial heart.
May 9 » Carlos Lamarca leads the first urban guerrilla action against the military dictatorship of Brazil in São Paulo, by robbing two banks.
October 1 » Concorde breaks the sound barrier for the first time.
November 3 » Vietnam War: U.S. President Richard M. Nixon addresses the nation on television and radio, asking the "silent majority" to join him in solidarity on the Vietnam War effort and to support his policies.
November 10 » National Educational Television (the predecessor to the Public Broadcasting Service) in the United States debuts Sesame Street.
When copying data from this family tree, please include a reference to the origin: Michael Jacobs, "Family tree Jacobs", database, Genealogy Online (https://www.genealogieonline.nl/stamboom-michael-jacobs/I102485.php : accessed February 18, 2026), "Gerrit van Herwijnen (1911-1969)".
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