The temperature on September 21, 1909 was between 6.2 °C and 15.3 °C and averaged 10.8 °C. There was 0.1 mm of rain. There was 3.8 hours of sunshine (31%). The average windspeed was 2 Bft (weak wind) and was prevailing from the south-southwest. Source: KNMI
February 12 » The National Association for the Advancement of Colored People (NAACP) is founded.
April 14 » A massacre is organized by the Ottoman Empire against the Armenian population of Cilicia.
April 18 » Joan of Arc is beatified in Rome.
June 26 » The Science Museum in London comes into existence as an independent entity.
August 30 » Burgess Shale fossils are discovered by Charles Doolittle Walcott.
September 7 » Eugène Lefebvre crashes a new French-built Wright biplane during a test flight at Juvisy, south of Paris, becoming the first aviator in the world to lose his life in a powered heavier-than-air craft.
When copying data from this family tree, please include a reference to the origin: Hendrik Dreyer, "Dreyer Tree", database, Genealogy Online (https://www.genealogieonline.nl/dreyer-tree/I11647.php : accessed February 3, 2026), "Hans Jurgen Dreyer (1909-)".
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