The temperature on July 13, 1915 was between 8.0 °C and 20.0 °C and averaged 15.0 °C. There was 7.6 hours of sunshine (46%). The average windspeed was 3 Bft (moderate breeze) and was prevailing from the west-southwest. 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 26 » The Rocky Mountain National Park is established by an act of the U.S. Congress.
February 8 » D. W. Griffith's controversial film The Birth of a Nation premieres in Los Angeles.
February 12 » In Washington, D.C., the first stone of the Lincoln Memorial is put into place.
August 17 » Jewish American Leo Frank is lynched in Marietta, Georgia after a 13-year-old girl is murdered.
September 5 » The pacifist Zimmerwald Conference begins.
September 30 » World War I: Radoje Ljutovac becomes the first soldier in history to shoot down an enemy aircraft with ground-to-air fire.
Day of death April 21, 1999
The temperature on April 21, 1999 was between 9.3 °C and 17.9 °C and averaged 12.5 °C. There was 10.5 mm of rain during 5.0 hours. There was 7.2 hours of sunshine (51%). The partly or heavily clouded was. The average windspeed was 3 Bft (moderate breeze) and was prevailing from the south-southwest. Source: KNMI
March 21 » Bertrand Piccard and Brian Jones become the first to circumnavigate the Earth in a hot air balloon.
May 1 » The body of British climber George Mallory is found on Mount Everest, 75 years after his disappearance in 1924.
July 10 » In women's association football, the United States defeated China in a penalty shoot-out at the Rose Bowl near Los Angeles to win the final match of the 1999 FIFA Women's World Cup. The final was watched by 90,185 spectators, which set a new world record for attendance at a women's sporting event.
July 31 » Discovery Program: Lunar Prospector: NASA intentionally crashes the spacecraft into the Moon, thus ending its mission to detect frozen water on the Moon's surface.
August 19 » In Belgrade, Yugoslavia, tens of thousands of Serbians rally to demand the resignation of Federal Republic of Yugoslavia President Slobodan Milošević.
October 27 » Gunmen open fire in the Armenian Parliament, killing the Prime Minister and seven others.
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/I187548.php : accessed October 14, 2026), "Harmen Siedsma (1915-1999)".
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