The temperature on April 25, 1911 was between 7.3 °C and 15.1 °C and averaged 10.7 °C. There was 1.1 hours of sunshine (8%). The average windspeed was 3 Bft (moderate breeze) and was prevailing from the west-southwest. Source: KNMI
January 12 » The University of the Philippines College of Law is formally established; three future Philippine presidents are among the first enrollees.
July 7 » The United States, UK, Japan, and Russia sign the North Pacific Fur Seal Convention of 1911 banning open-water seal hunting, the first international treaty to address wildlife preservation issues.
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 29 » Italy declares war on the Ottoman Empire.
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 14 » Roald Amundsen's team, comprising himself, Olav Bjaaland, Helmer Hanssen, Sverre Hassel, and Oscar Wisting, becomes the first to reach the South Pole.
Day of marriage October 23, 1947
The temperature on October 23, 1947 was between 7.6 °C and 14.9 °C and averaged 11.1 °C. There was 1.0 mm of rain during 1.4 hours. There was 0.9 hours of sunshine (9%). The average windspeed was 2 Bft (weak wind) and was prevailing from the south east. Source: KNMI
March 29 » Malagasy Uprising against French colonial rule in Madagascar.
April 9 » The Glazier–Higgins–Woodward tornadoes kill 181 and injure 970 in Texas, Oklahoma, and Kansas.
April 16 » An explosion on board a freighter in port causes the city of Texas City, Texas, to catch fire, killing almost 600.
July 19 » Prime Minister of the shadow Burmese government, Bogyoke Aung San and eight others are assassinated.
August 7 » Thor Heyerdahl's balsa wood raft, the Kon-Tiki, smashes into the reef at Raroia in the Tuamotu Islands after a 101-day, 7,000 kilometres (4,300mi) journey across the Pacific Ocean in an attempt to prove that pre-historic peoples could have traveled from South America.
December 6 » The Everglades National Park in Florida is dedicated.
When copying data from this family tree, please include a reference to the origin: J Eijsermans, "Eijsermans family tree", database, Genealogy Online (https://www.genealogieonline.nl/stamboom-eijsermans/I268845.php : accessed January 20, 2026), "Antonius J.C.M. van Opstal (1911-< 2005)".
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