January 23 » The Malolos Constitution is inaugurated, establishing the First Philippine Republic. Emilio Aguinaldo is sworn in as its first President.
February 14 » Voting machines are approved by the U.S. Congress for use in federal elections.
March 6 » Bayer registers "Aspirin" as a trademark.
March 30 » German Society of Chemistry issues an invitation to other national scientific organizations to appoint delegates to the International Committee on Atomic Weights.
November 2 » The Boers begin their 118-day siege of British-held Ladysmith during the Second Boer War.
Day of death May 10, 1900
The temperature on May 10, 1900 was about 12.9 °C. The airpressure was 76 cm mercury. The atmospheric humidity was 52%. Source: KNMI
February 7 » Second Boer War: British troops fail in their third attempt to lift the Siege of Ladysmith.
May 18 » The United Kingdom proclaims a protectorate over Tonga.
June 14 » The second German Naval Law calls for the Imperial German Navy to be doubled in size, resulting in an Anglo-German naval arms race.
June 21 » Boxer Rebellion. China formally declares war on the United States, Britain, Germany, France and Japan, as an edict issued from the Empress Dowager Cixi.
July 2 » Jean Sibelius' Finlandia receives its première performance in Helsinki with the Helsinki Philharmonic Society conducted by Robert Kajanus.
October 19 » Max Planck discovers Planck's law of black-body radiation.
When copying data from this family tree, please include a reference to the origin: Jaap Geensen, "Geensen database", database, Genealogy Online (https://www.genealogieonline.nl/geensen-database/I310.php : accessed October 4, 2026), "Teuntje Magdalena Geensen (1899-1900)".
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