The temperature on April 10, 1887 was about 10.4 °C. The air pressure was 9 kgf/m2 and came mainly from the north-northeast. The airpressure was 77 cm mercury. The atmospheric humidity was 65%. Source: KNMI
In The Netherlands , there was from April 23, 1884 to April 21, 1888 the cabinet Heemskerk, with Mr. J. Heemskerk Azn. (conservatief) as prime minister.
April 28 » A week after being arrested by the Prussian Secret Police, French police inspector Guillaume Schnaebelé is released on order of William I, German Emperor, defusing a possible war.
May 9 » Buffalo Bill Cody's Wild West Show opens in London.
June 23 » The Rocky Mountains Park Act becomes law in Canada creating the nation's first national park, Banff National Park.
July 6 » David Kalākaua, monarch of the Kingdom of Hawaii, is forced to sign the Bayonet Constitution, which transfers much of the king's authority to the Legislature of the Kingdom of Hawaii.
September 5 » A fire at the Theatre Royal, Exeter, kills 186.
November 9 » The United States receives rights to Pearl Harbor, Hawaii.
Day of marriage January 11, 1923
The temperature on January 11, 1923 was between 2.7 °C and 6.4 °C and averaged 4.0 °C. There was 0.8 mm of rain. There was 2.4 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 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.
March 20 » The Arts Club of Chicago hosts the opening of Pablo Picasso's first United States showing, entitled Original Drawings by Pablo Picasso, becoming an early proponent of modern art in the United States.
August 2 » Vice President Calvin Coolidge becomes U.S. President upon the death of President Warren G. Harding.
September 7 » The International Criminal Police Organization (INTERPOL) is formed.
September 8 » Honda Point disaster: Nine US Navy destroyers run aground off the California coast. Seven are lost, and twenty-three sailors killed.
September 29 » The French Mandate for Syria and the Lebanon takes effect.
November 11 » Adolf Hitler was arrested in Munich for high treason for his role in the Beer Hall Putsch.
Day of death September 9, 1941
The temperature on September 9, 1941 was between 8.1 °C and 17.0 °C and averaged 13.1 °C. There was 1.6 hours of sunshine (12%). The average windspeed was 2 Bft (weak wind) and was prevailing from the west. Source: KNMI
In The Netherlands , there was from September 3, 1940 to July 27, 1941 the cabinet Gerbrandy I, with Prof. dr. P.S. Gerbrandy (ARP) as prime minister.
In The Netherlands , there was from July 27, 1941 to February 23, 1945 the cabinet Gerbrandy II, with Prof. dr. P.S. Gerbrandy (ARP) as prime minister.
January 5 » 37-year-old pilot Amy Johnson, the first woman to fly solo from London to Australia, disappears after bailing out of her plane over the River Thames, and is presumed dead.
June 1 » World War II: The Battle of Crete ends as Crete capitulates to Germany.
June 22 » World War II: Nazi Germany invades the Soviet Union in Operation Barbarossa.
July 13 » World War II: Montenegrins begin a popular uprising against the Axis powers (Trinaestojulski ustanak).
July 31 » World War II: The Battle of Smolensk concludes with Germany capturing about 300,000 Soviet Red Army prisoners.
December 24 » World War II: Kuching is conquered by Japanese forces.
When copying data from this family tree, please include a reference to the origin: Hendrik de Graaf, "Family tree Plugboer", database, Genealogy Online (https://www.genealogieonline.nl/stamboom-plugboer/I4224.php : accessed February 15, 2026), "Gerardus Hendricus Keijsper (1887-1941)".
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