March 13 » British forces occupy Bloemfontein, Orange Free State, during the Second Boer War.
March 24 » Mayor of New York City Robert Anderson Van Wyck breaks ground for a new underground "Rapid Transit Railroad" that would link Manhattan and Brooklyn.
April 15 » Philippine–American War: Filipino guerrillas launch a surprise attack on U.S. infantry and begin a four-day siege of Catubig, Philippines.
May 22 » The Associated Press is formed in New York City as a non-profit news cooperative.
June 18 » Empress Dowager Cixi of China orders all foreigners killed, including foreign diplomats and their families.
December 14 » Quantum mechanics: Max Planck presents a theoretical derivation of his black-body radiation law.
Day of death August 18, 1900
The temperature on August 18, 1900 was about 23.4 °C. The airpressure was 76 cm mercury. The atmospheric humidity was 78%. Source: KNMI
February 27 » Fußball-Club Bayern München is founded.
March 13 » British forces occupy Bloemfontein, Orange Free State, during the Second Boer War.
March 18 » AFC Ajax Amsterdam, The Netherlands's biggest and most successful football club, was founded.
June 5 » Second Boer War: British soldiers take Pretoria.
August 16 » The Battle of Elands River during the Second Boer War ends after a 13-day siege is lifted by the British. The battle had begun when a force of between 2,000 and 3,000 Boers had surrounded a force of 500 Australians, Rhodesians, Canadians and British soldiers at a supply dump at Brakfontein Drift.
December 14 » Quantum mechanics: Max Planck presents a theoretical derivation of his black-body radiation law.
When copying data from this family tree, please include a reference to the origin: Wilfried Celis, "Family tree Celis", database, Genealogy Online (https://www.genealogieonline.nl/stamboom-celis/I416.php : accessed January 21, 2026), "Joanna Carolina CELIS (1900-1900)".
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