The temperature on June 17, 1887 was about 19.7 °C. The air pressure was 28 kgf/m2 and came mainly from the northeast. The airpressure was 77 cm mercury. The atmospheric humidity was 58%. 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 10 » On Easter Sunday, Pope Leo XIII authorizes the establishment of the Catholic University of America.
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.
June 23 » The Rocky Mountains Park Act becomes law in Canada creating the nation's first national park, Banff National Park.
July 26 » Publication of the Unua Libro, founding the Esperanto movement.
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 April 28, 1917
The temperature on April 28, 1917 was between 5.6 °C and 10.3 °C and averaged 8.0 °C. There was 0.1 hours of sunshine (1%). The average windspeed was 3 Bft (moderate breeze) and was prevailing from the west. Source: KNMI
In The Netherlands , there was from August 29, 1913 to September 9, 1918 the cabinet Cort van der Linden, with Mr. P.W.A. Cort van der Linden (liberaal) as prime minister.
February 23 » First demonstrations in Saint Petersburg, Russia. The beginning of the February Revolution (March 8 in the Gregorian calendar).
April 12 » World War I: Canadian forces successfully complete the taking of Vimy Ridge from the Germans.
June 26 » World War I: The American Expeditionary Forces begin to arrive in France. They will first enter combat four months later.
June 28 » World War I: Greece joins the Allied powers.
November 5 » October Revolution: Lenin calls for the October Revolution.
November 20 » World War I: Battle of Cambrai begins: British forces make early progress in an attack on German positions but are later pushed back.
Day of death December 31, 1961
The temperature on December 31, 1961 was between 0.4 °C and 5.0 °C and averaged 2.8 °C. There was 14.8 mm of rain during 12.6 hours. The almost completely overcast was. The average windspeed was 2 Bft (weak wind) and was prevailing from the north-northwest. Source: KNMI
May 1 » The Prime Minister of Cuba, Fidel Castro, proclaims Cuba a socialist nation and abolishes elections.
May 9 » FCC Chairman Newton N. Minow gives his Wasteland Speech.
September 1 » The Eritrean War of Independence officially begins with the shooting of Ethiopian police by Hamid Idris Awate.
October 30 » The Soviet Union detonates the Tsar Bomba, the most powerful explosive device ever detonated.
November 12 » Terry Jo Duperrault is the sole survivor of a series of brutal murders aboard the Ketch Bluebelle.
November 29 » Project Mercury: Mercury-Atlas 5 Mission: Enos, a chimpanzee, is launched into space. The spacecraft orbits the Earth twice and splashes down off the coast of Puerto Rico.
When copying data from this family tree, please include a reference to the origin: Jan Kaper, "Family tree Kaper", database, Genealogy Online (https://www.genealogieonline.nl/stamboom-kaper/I63209.php : accessed March 3, 2026), "Harmina de Graaf (1887-1961)".
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