The temperature on October 7, 1875 was about 15.8 °C. The air pressure was 16 kgf/m2 and came mainly from the west-southwest. The airpressure was 77 cm mercury. The atmospheric humidity was 75%. Source: KNMI
From August 27, 1874 till November 3, 1877 the Netherlands had a cabinet Heemskerk - Van Lijnden van Sandenburg with the prime ministers Mr. J. Heemskerk Azn. (conservatief) and Mr. C.Th. baron Van Lijnden van Sandenburg (AR).
January 5 » The Palais Garnier, one of the most famous opera houses in the world, is inaugurated in Paris.
April 4 » Vltava, composed by Czech composer Bedřich Smetana and also known by its German name Die Moldau, premiered in Prague.
May 1 » Alexandra Palace reopens after being burned down in a fire in 1873.
May 20 » Signing of the Metre Convention by 17 nations leading to the establishment of the International System of Units.
June 19 » The Herzegovinian rebellion against the Ottoman Empire begins.
September 3 » The first official game of polo is played in Argentina after being introduced by British ranchers.
Day of death April 27, 1961
The temperature on April 27, 1961 was between 8.9 °C and 15.0 °C and averaged 11.2 °C. There was 4.5 mm of rain during 2.4 hours. There was 3.2 hours of sunshine (22%). The heavily clouded was. The average windspeed was 2 Bft (weak wind) and was prevailing from the west-southwest. Source: KNMI
January 26 » John F. Kennedy appoints Janet G. Travell to be the first woman Physician to the President.
February 4 » The Angolan War of Independence and the greater Portuguese Colonial War begin.
February 16 » Explorer program: Explorer 9 (S-56a) is launched.
March 9 » Sputnik 9 successfully launches, carrying a dog and a human dummy, and demonstrating that the Soviet Union was ready to begin human spaceflight.
March 24 » Quebec Board of the French Language is established.
December 2 » In a nationally broadcast speech, Cuban leader Fidel Castro declares that he is a Marxist–Leninist and that Cuba is going to adopt Communism.
Day of cremation May 2, 1961
The temperature on May 2, 1961 was between 10.0 °C and 16.1 °C and averaged 12.2 °C. There was 5.2 mm of rain during 3.9 hours. There was 5.1 hours of sunshine (34%). The partly or heavily clouded was. The average windspeed was 3 Bft (moderate breeze) and was prevailing from the south-southwest. Source: KNMI
January 3 » The SL-1 nuclear reactor is destroyed by a steam explosion in the only reactor incident in the United States to cause immediate fatalities.
January 25 » In Washington, D.C., President John F. Kennedy delivers the first live presidential television news conference.
January 31 » Project Mercury: Mercury-Redstone 2: Ham the Chimp travels into outer space.
February 12 » The Soviet Union launches Venera 1 towards Venus.
May 4 » American civil rights movement: The "Freedom Riders" begin a bus trip through the South.
August 13 » Cold War: East Germany closes the border between the eastern and western sectors of Berlin to thwart its inhabitants' attempts to escape to the West, and construction of the Berlin Wall is started.
When copying data from this family tree, please include a reference to the origin: Sim Mostert, "Genealogy Pot en Smit", database, Genealogy Online (https://www.genealogieonline.nl/genealogie_pot_smit/I7324.php : accessed October 18, 2026), "LODEWIJK CORNELIS de GROOT (1875-1961)".
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