The temperature on April 4, 1887 was about 13.6 °C. The air pressure was 30 kgf/m2 and came mainly from the southwest. The airpressure was 75 cm mercury. The atmospheric humidity was 56%. 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.
February 23 » The French Riviera is hit by a large earthquake, killing around 2,000.
April 4 » Argonia, Kansas elects Susanna M. Salter as the first female mayor in the United States.
May 9 » Buffalo Bill Cody's Wild West Show opens in London.
June 18 » The Reinsurance Treaty between Germany and Russia is signed.
October 1 » Balochistan is conquered by the British Empire.
November 9 » The United States receives rights to Pearl Harbor, Hawaii.
Day of marriage April 20, 1911
The temperature on April 20, 1911 was between 3.9 °C and 15.2 °C and averaged 9.6 °C. There was 11.7 hours of sunshine (82%). The average windspeed was 3 Bft (moderate breeze) and was prevailing from the west-southwest. Source: KNMI
January 3 » A magnitude 7.7 earthquake destroys the city of Almaty in Russian Turkestan.
January 12 » The University of the Philippines College of Law is formally established; three future Philippine presidents are among the first enrollees.
June 16 » IBM founded as the Computing-Tabulating-Recording Company in Endicott, New York.
August 21 » The Mona Lisa is stolen by Vincenzo Peruggia, a Louvre employee.
November 11 » Many cities in the Midwestern United States break their record highs and lows on the same day as a strong cold front rolls through.
December 29 » Mongolia gains independence from the Qing dynasty, enthroning 8th Jebtsundamba Khutughtu as Khagan of Mongolia.
Day of death September 20, 1968
The temperature on September 20, 1968 was between 9.4 °C and 18.2 °C and averaged 13.7 °C. There was 2.8 mm of rain during 2.8 hours. There was 1.9 hours of sunshine (15%). The partly or heavily clouded was. The average windspeed was 3 Bft (moderate breeze) and was prevailing from the south-southwest. Source: KNMI
January 24 » Vietnam War: The 1st Australian Task Force launches Operation Coburg against the North Vietnamese Army and Viet Cong during wider fighting around Long Bình and Biên Hòa.
February 12 » Phong Nhị and Phong Nhất massacre.
March 31 » American President Lyndon B. Johnson speaks to the nation of "Steps to Limit the War in Vietnam" in a television address. At the conclusion of his speech, he announces: "I shall not seek, and I will not accept, the nomination of my party for another term as your President."
April 4 » A.E.K. Athens B.C. becomes the first Greek team to win the European Basketball Cup.
June 5 » Presidential candidate Robert F. Kennedy is assassinated by Sirhan Sirhan.
September 11 » Air France Flight 1611 crashes off Nice, France, killing 89 passengers and six crew.
When copying data from this family tree, please include a reference to the origin: Peter Keesman, "Family tree Keesman", database, Genealogy Online (https://www.genealogieonline.nl/stamboom-keesman/I4685.php : accessed February 24, 2026), "Willem Hartog (1887-1968)".
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