The temperature on October 21, 1915 was between 2.8 °C and 12.5 °C and averaged 7.1 °C. There was 2.6 hours of sunshine (25%). The average windspeed was 2 Bft (weak wind) and was prevailing from the south east. Source: KNMI
In The Netherlands , there was from August 29, 1913 to September 9, 1918 the cabinet Cort van der Linden, with Mr. P.W.A. Cort van der Linden (liberaal) as prime minister.
January 17 » Russia defeats Ottoman Turkey in the Battle of Sarikamish during the Caucasus Campaign of World War I.
February 8 » D. W. Griffith's controversial film The Birth of a Nation premieres in Los Angeles.
May 1 » The RMSLusitania departs from New York City on her 202nd, and final, crossing of the North Atlantic. Six days later, the ship is torpedoed off the coast of Ireland with the loss of 1,198 lives.
July 16 » At Treasure Island on the Delaware River in the United States, the First Order of the Arrow ceremony takes place and the Order of the Arrow is founded to honor American Boy Scouts who best exemplify the Scout Oath and Law.
August 6 » World War I: Battle of Sari Bair: The Allies mount a diversionary attack timed to coincide with a major Allied landing of reinforcements at Suvla Bay.
November 25 » Albert Einstein presents the field equations of general relativity to the Prussian Academy of Sciences.
When copying data from this family tree, please include a reference to the origin: Hans Weening, "Family tree Weening", database, Genealogy Online (https://www.genealogieonline.nl/stamboom-weening/I190136.php : accessed February 23, 2026), "Reinder Siersema (1915-)".
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