The temperature on January 15, 1911 was between -8.8 °C and -3.3 °C and averaged -6.0 °C. There was 2.9 hours of sunshine (35%). The average windspeed was 2 Bft (weak wind) and was prevailing from the south-southeast. Source: KNMI
April 8 » Dutch physicist Heike Kamerlingh Onnes discovers superconductivity.
May 21 » President of Mexico Porfirio Díaz and the revolutionary Francisco Madero sign the Treaty of Ciudad Juárez to put an end to the fighting between the forces of both men, concluding the initial phase of the Mexican Revolution.
June 28 » The Nakhla meteorite, the first one to suggest signs of aqueous processes on Mars, falls to Earth, landing in Egypt.
August 1 » Harriet Quimby takes her pilot's test and becomes the first U.S. woman to earn an Aero Club of America aviator's certificate.
September 18 » Russian Premier Pyotr Stolypin is shot at the Kiev Opera House.
October 5 » The Kowloon–Canton Railway commences service.
Day of death January 17, 1981
The temperature on January 17, 1981 was between 2.3 °C and 5.7 °C and averaged 4.1 °C. There was 1.1 mm of rain during 3.2 hours. There was 1.0 hours of sunshine (12%). The heavily clouded was. The average windspeed was 3 Bft (moderate breeze) and was prevailing from the west-southwest. Source: KNMI
In The Netherlands , there was from Monday, December 19, 1977 to Friday, September 11, 1981 the cabinet Van Agt I, with Mr. A.A.M. van Agt (CDA/KVP) as prime minister.
In The Netherlands , there was from Friday, September 11, 1981 to Saturday, May 29, 1982 the cabinet Van Agt II, with Mr. A.A.M. van Agt (CDA) as prime minister.
February 13 » A series of sewer explosions destroys more than two miles of streets in Louisville, Kentucky.
May 26 » An EA-6B Prowler crashes on the flight deck of the aircraft carrier USSNimitz, killing 14 crewmen and injuring 45 others.
July 17 » A structural failure leads to the collapse of a walkway at the Hyatt Regency in Kansas City, Missouri, killing 114 people and injuring more than 200.
August 30 » President Mohammad-Ali Rajai and Prime Minister Mohammad-Javad Bahonar of Iran are assassinated in a bombing committed by the People's Mujahedin of Iran.
November 1 » Antigua and Barbuda gains independence from the United Kingdom.
November 11 » Antigua and Barbuda joins the United Nations.
Day of cremation January 22, 1981
The temperature on January 22, 1981 was between 1.3 °C and 3.8 °C and averaged 2.8 °C. There was 0.8 mm of rain during 4.4 hours. The almost completely overcast was. The average windspeed was 2 Bft (weak wind) and was prevailing from the south. Source: KNMI
In The Netherlands , there was from Monday, December 19, 1977 to Friday, September 11, 1981 the cabinet Van Agt I, with Mr. A.A.M. van Agt (CDA/KVP) as prime minister.
In The Netherlands , there was from Friday, September 11, 1981 to Saturday, May 29, 1982 the cabinet Van Agt II, with Mr. A.A.M. van Agt (CDA) as prime minister.
When copying data from this family tree, please include a reference to the origin: Dirk Zwinderman, "Family tree Zwinderman", database, Genealogy Online (https://www.genealogieonline.nl/stamboom-zwinderman/I5564.php : accessed March 15, 2026), "Heiltinus Zwinderman (1911-1981)".
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