The temperature on September 23, 1911 was between 2.4 °C and 20.2 °C and averaged 11.7 °C. There was 9.8 hours of sunshine (80%). The average windspeed was 2 Bft (weak wind) and was prevailing from the northeast. Source: KNMI
January 12 » The University of the Philippines College of Law is formally established; three future Philippine presidents are among the first enrollees.
January 26 » Glenn Curtiss flies the first successful American seaplane.
July 4 » A massive heat wave strikes the northeastern United States, killing 380 people in eleven days and breaking temperature records in several cities.
September 20 » The White Star Line's RMSOlympic collides with the British warship HMSHawke.
September 23 » Pilot Earle Ovington makes the first official airmail delivery in America under the authority of the United States Post Office Department
December 27 » "Jana Gana Mana", the national anthem of India, is first sung in the Calcutta Session of the Indian National Congress.
When copying data from this family tree, please include a reference to the origin: Ferry Posthuma Scholtes, "Family tree Posthuma", database, Genealogy Online (https://www.genealogieonline.nl/stamboom-posthuma/R143.php : accessed September 28, 2026), "Hendrik Lambertus Johannes Sloet (1911-)".
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