The temperature on May 20, 1911 was between 8.8 °C and 15.8 °C and averaged 11.3 °C. There was 4.2 hours of sunshine (26%). The average windspeed was 3 Bft (moderate breeze) and was prevailing from the north. Source: KNMI
January 15 » Palestinian Arabic-language Falastin newspaper founded.
April 8 » Dutch physicist Heike Kamerlingh Onnes discovers superconductivity.
April 29 » Tsinghua University, one of mainland China's leading universities, is founded.
July 24 » Hiram Bingham III re-discovers Machu Picchu, "the Lost City of the Incas".
October 9 » An accidental bomb explosion triggers the Wuchang Uprising against the Chinese monarchy.
December 14 » Roald Amundsen's team, comprising himself, Olav Bjaaland, Helmer Hanssen, Sverre Hassel, and Oscar Wisting, becomes the first to reach the South Pole.
When copying data from this family tree, please include a reference to the origin: Bert de Jonge, "Family tree De Jonge", database, Genealogy Online (https://www.genealogieonline.nl/stamboom-de-jonge/I252.php : accessed February 11, 2026), "Jantina Cathrina Bos (1879-????)".
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