January 2 » American statesman and diplomat John Hay announces the Open Door Policy to promote trade with China.
May 17 » Second Boer War: British troops relieve Mafeking.
June 20 » Baron Eduard Toll, leader of the Russian Polar Expedition of 1900, departs Saint Petersburg in Russia on the explorer ship Zarya, never to return.
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.
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: Gerard Hazelaar, "Ancestors Hazelaar Struijk", database, Genealogy Online (https://www.genealogieonline.nl/kwartierstaat-hazelaar-struijk/I1067781724.php : accessed June 9, 2024), "Johan Hazelaar (1899-1900)".
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