The temperature on March 30, 1911 was between 8.7 °C and 21.3 °C and averaged 14.5 °C. There was 4.7 hours of sunshine (37%). The average windspeed was 3 Bft (moderate breeze) and was prevailing from the south east. Source: KNMI
January 5 » Kappa Alpha Psi, the world's third oldest and largest black fraternity, is founded at Indiana University.
April 8 » Dutch physicist Heike Kamerlingh Onnes discovers superconductivity.
August 14 » United States Senate leaders agree to rotate the office of President pro tempore of the Senate among leading candidates to fill the vacancy left by William P. Frye's death.
September 25 » An explosion of badly degraded propellant charges on board the French battleship Liberté detonates the forward ammunition magazines and destroys the ship.
November 17 » Omega Psi Phi fraternity was founded on the campus of Howard University in Washington, D.C.
December 29 » Mongolia gains independence from the Qing dynasty, enthroning 8th Jebtsundamba Khutughtu as Khagan of Mongolia.
Day of marriage July 29, 1938
The temperature on July 29, 1938 was between 8.3 °C and 21.4 °C and averaged 15.7 °C. There was 13.0 hours of sunshine (83%). The average windspeed was 2 Bft (weak wind) and was prevailing from the southwest. Source: KNMI
February 11 » BBC Television produces the world's first ever science fiction television programme, an adaptation of a section of the Karel Čapek play R.U.R., that coined the term "robot".
April 10 » The 1938 German parliamentary election and referendum seeks approval for a single list of Nazi candidates and the recent annexation of Austria.
May 26 » In the United States, the House Un-American Activities Committee begins its first session.
June 25 » Dr. Douglas Hyde is inaugurated as the first President of Ireland.
October 14 » The first flight of the Curtiss P-40 Warhawk fighter plane.
November 16 » LSD is first synthesized by Albert Hofmann from ergotamine at the Sandoz Laboratories in Basel.
Day of death November 14, 1969
The temperature on November 14, 1969 was between 0.9 °C and 9.0 °C and averaged 5.6 °C. There was 1.9 mm of rain during 1.3 hours. There was 1.6 hours of sunshine (18%). The partly clouded was. The average windspeed was 3 Bft (moderate breeze) and was prevailing from the south. Source: KNMI
January 5 » The Venera 5 space probe is launched at 06:28:08 UTC from Baikonur.
April 5 » Vietnam War: Massive antiwar demonstrations occur in many U.S. cities.
May 15 » People's Park: California Governor Ronald Reagan has an impromptu student park owned by the University of California at Berkeley fenced off from student anti-war protestors, sparking a riot.
May 26 » Apollo program: Apollo 10 returns to Earth after a successful eight-day test of all the components needed for the forthcoming first manned moon landing.
July 16 » Apollo program: Apollo 11, the first mission to land astronauts on the Moon, is launched from the Kennedy Space Center at Cape Kennedy, Florida.
December 24 » Nigerian troops capture Umuahia, the Biafran capital.
When copying data from this family tree, please include a reference to the origin: Joop Klavers, "Family tree Klavers", database, Genealogy Online (https://www.genealogieonline.nl/stamboom_klavers/I76887.php : accessed February 26, 2026), "Jantje Hanekamp (1911-1969)".
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