April 20 » Pierre and Marie Curie refine radium chloride.
May 17 » Greek archaeologist Valerios Stais discovers the Antikythera mechanism, an ancient mechanical analog computer.
May 20 » Cuba gains independence from the United States. Tomás Estrada Palma becomes the country's first President.
May 31 » Second Boer War: The Treaty of Vereeniging ends the war and ensures British control of South Africa.
June 28 » The U.S. Congress passes the Spooner Act, authorizing President Theodore Roosevelt to acquire rights from Colombia for the Panama Canal.
August 22 » Theodore Roosevelt becomes the first President of the United States to make a public appearance in an automobile.
Day of marriage July 30, 1929
The temperature on July 30, 1929 was between 13.5 °C and 20.2 °C and averaged 16.5 °C. There was 4.7 hours of sunshine (30%). The average windspeed was 3 Bft (moderate breeze) and was prevailing from the west-southwest. Source: KNMI
In The Netherlands , there was from March 8, 1926 to August 10, 1929 the cabinet De Geer I, with Jonkheer mr. D.J. de Geer (CHU) as prime minister.
In The Netherlands , there was from August 10, 1929 to May 26, 1933 the cabinet Ruys de Beerenbrouck III, with Jonkheer mr. Ch.J.M. Ruys de Beerenbrouck (RKSP) as prime minister.
January 20 » The first full-length talking motion picture filmed outdoors, In Old Arizona, is released.
February 26 » President Calvin Coolidge signs an executive order establishing the 96,000 acre Grand Teton National Park in Wyoming.
May 15 » A fire at the Cleveland Clinic in Cleveland, Ohio kills 123.
September 24 » Jimmy Doolittle performs the first flight without a window, proving that full instrument flying from take off to landing is possible.
November 7 » In New York City, the Museum of Modern Art opens to the public.
December 19 » The Indian National Congress promulgates the Purna Swaraj (the Declaration of the Independence of India).
Day of death February 19, 1972
The temperature on February 19, 1972 was between 0.7 °C and 2.7 °C and averaged 1.9 °C. There was -0.1 mm of rain. The almost completely overcast was. The average windspeed was 4 Bft (moderate breeze) and was prevailing from the northeast. Source: KNMI
In The Netherlands , there was from April 5, 1967 to Tuesday, July 6, 1971 the cabinet Biesheuvel I, with Mr. B.W. Biesheuvel (ARP) as prime minister.
In The Netherlands , there was from Thursday, July 20, 1972 to Friday, May 11, 1973 the cabinet Biesheuvel II, with Mr. B.W. Biesheuvel (ARP) as prime minister.
February 15 » Sound recordings are granted U.S. federal copyright protection for the first time.
March 20 » The Troubles: The first Provisional IRA car bombing in Belfast kills seven people and injures 148 others in Northern Ireland.
April 13 » Vietnam War: The Battle of An Lộc begins.
May 4 » The Don't Make A Wave Committee, a fledgling environmental organization founded in Canada in 1971, officially changes its name to "Greenpeace Foundation".
December 11 » Apollo 17 becomes the sixth and final Apollo mission to land on the Moon.
December 29 » Eastern Air Lines Flight 401 (a Lockheed L-1011 TriStar) crashes in the Florida Everglades on approach to Miami International Airport, Florida, killing 101 of the 176 people on board.
When copying data from this family tree, please include a reference to the origin: Hans Weening, "Family tree Weening", database, Genealogy Online (https://www.genealogieonline.nl/stamboom-weening/I134158.php : accessed October 9, 2026), "Henderikus Ploegh (1902-1972)".
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