The temperature on September 11, 1909 was between 11.2 °C and 21.2 °C and averaged 15.9 °C. There was 9.6 hours of sunshine (74%). The average windspeed was 3 Bft (moderate breeze) and was prevailing from the south east. Source: KNMI
February 2 » The Paris Film Congress opens. An attempt by European producers to form an equivalent to the MPCC cartel in the United States.
March 23 » Theodore Roosevelt leaves New York for a post-presidency safari in Africa. The trip is sponsored by the Smithsonian Institution and National Geographic Society.
April 9 » The U.S. Congress passes the Payne–Aldrich Tariff Act.
July 16 » Persian Constitutional Revolution: Mohammad Ali Shah Qajar is forced out as Shah of Persia and is replaced by his son Ahmad Shah Qajar.
August 24 » Workers start pouring concrete for the Panama Canal.
December 10 » Selma Lagerlöf becomes the first female writer to win the Nobel Prize in Literature.
When copying data from this family tree, please include a reference to the origin: Tjitze Koster, "Family tree Koster Twijslerheide e.o.", database, Genealogy Online (https://www.genealogieonline.nl/stamboom-koster/I4090.php : accessed February 14, 2026), "Libbe Koster (1909-)".
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