January 2 » American statesman and diplomat John Hay announces the Open Door Policy to promote trade with China.
April 2 » The United States Congress passes the Foraker Act, giving Puerto Rico limited self-rule.
June 5 » Second Boer War: British soldiers take Pretoria.
July 2 » The first Zeppelin flight takes place on Lake Constance near Friedrichshafen, Germany.
September 17 » Philippine–American War: Filipinos under Juan Cailles defeat Americans under Colonel Benjamin F. Cheatham Jr. at Mabitac.
October 19 » Max Planck discovers Planck's law of black-body radiation.
Day of marriage April 30, 1924
The temperature on April 30, 1924 was between 2.3 °C and 12.0 °C and averaged 7.5 °C. There was 6.4 mm of rain. There was 0.9 hours of sunshine (6%). The average windspeed was 2 Bft (weak wind) and was prevailing from the east. Source: KNMI
In The Netherlands , there was from September 19, 1922 to August 4, 1925 the cabinet Ruys de Beerenbrouck II, with Jonkheer mr. Ch.J.M. Ruys de Beerenbrouck (RKSP) as prime minister.
January 22 » Ramsay MacDonald becomes the first Labour Prime Minister of the United Kingdom.
January 25 » The 1924 Winter Olympics opens in Chamonix, in the French Alps, inaugurating the Winter Olympic Games.
February 12 » George Gershwin's Rhapsody in Blue received its premiere in a concert titled "An Experiment in Modern Music", in Aeolian Hall, New York, by Paul Whiteman and his band, with Gershwin playing the piano.
May 10 » J. Edgar Hoover is appointed first Director of the United States' Federal Bureau of Investigation (FBI), and remains so until his death in 1972.
August 4 » Diplomatic relations between Mexico and the Soviet Union are established.
October 7 » Andreas Michalakopoulos becomes prime minister of Greece for a short period of time.
Day of death August 7, 1987
The temperature on August 7, 1987 was between 9.7 °C and 18.1 °C and averaged 13.9 °C. There was -0.1 mm of rain. There was 4.9 hours of sunshine (32%). The heavily clouded was. The average windspeed was 2 Bft (weak wind) and was prevailing from the west-southwest. Source: KNMI
In The Netherlands , there was from Tuesday, November 4, 1986 to Tuesday, November 7, 1989 the cabinet Lubbers II, with Drs. R.F.M. Lubbers (CDA) as prime minister.
January 4 » The Maryland train collision: An Amtrak train en route to Boston from Washington, D.C., collides with Conrail engines in Chase, Maryland, United States, killing 16 people.
March 7 » Lieyu massacre: Taiwanese military massacre of 19 unarmed Vietnamese refugees at Donggang, Lieyu, Kinmen.
April 19 » The Simpsons first appear as a series of shorts on The Tracey Ullman Show, first starting with Good Night.
July 24 » Hulda Crooks, at 91 years of age, climbed Mt. Fuji. Crooks became the oldest person to climb Japan's highest peak.
October 7 » Sikh nationalists declare the independence of Khalistan from India; it is not internationally recognized.
November 7 » In Tunisia, president Habib Bourguiba is overthrown and replaced by Prime Minister Zine El Abidine Ben Ali.
When copying data from this family tree, please include a reference to the origin: Gert Jonker, "Family tree Jonker", database, Genealogy Online (https://www.genealogieonline.nl/jonker_stamboom/I7804.php : accessed January 21, 2026), "Jacob Groenhof (1900-1987)".
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