The temperature on January 5, 1915 was between 1.1 °C and 6.7 °C and averaged 3.4 °C. There was 4.1 mm of rain. The average windspeed was 3 Bft (moderate breeze) and was prevailing from the northwest. 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.
February 12 » In Washington, D.C., the first stone of the Lincoln Memorial is put into place.
March 20 » Albert Einstein publishes his general theory of relativity.
April 24 » The arrest of 250 Armenian intellectuals and community leaders in Istanbul marks the beginning of the Armenian Genocide.
June 5 » Denmark amends its constitution to allow women's suffrage.
July 7 » The First Battle of the Isonzo comes to an end.
August 4 » World War I: The German 12th Army occupies Warsaw during the Gorlice–Tarnów Offensive and the Great Retreat of 1915.
Day of death July 9, 1969
The temperature on July 9, 1969 was between 7.9 °C and 16.1 °C and averaged 11.6 °C. There was 5.1 mm of rain during 2.8 hours. There was 4.4 hours of sunshine (27%). The partly clouded was. The average windspeed was 2 Bft (weak wind) and was prevailing from the northwest. Source: KNMI
January 30 » The Beatles' last public performance, on the roof of Apple Records in London. The impromptu concert is broken up by the police.
April 17 » Sirhan Sirhan is convicted of assassinating Robert F. Kennedy.
April 22 » British yachtsman Sir Robin Knox-Johnston wins the Sunday Times Golden Globe Race and completes the first solo non-stop circumnavigation of the world.
July 19 » Chappaquiddick incident: U.S. Senator Ted Kennedy crashes his car into a tidal pond at Chappaquiddick Island, Massachusetts, killing his passenger Mary Jo Kopechne.
September 1 » A coup in Libya brings Muammar Gaddafi to power.
December 6 » Altamont Free Concert: At a free concert performed by the Rolling Stones, eighteen-year old Meredith Hunter is stabbed to death by Hells Angels security guards.
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/I144308.php : accessed October 20, 2026), "Pieter Zijlstra (1915-1969)".
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