The temperature on November 15, 1912 was between 4.3 °C and 10.8 °C and averaged 6.9 °C. There was 0.2 mm of rain. The average windspeed was 2 Bft (weak wind) and was prevailing from the west-northwest. Source: KNMI
January 6 » German geophysicist Alfred Wegener first presents his theory of continental drift.
January 11 » Immigrant textile workers in Lawrence, Massachusetts, go on strike when wages are reduced in response to a mandated shortening of the work week.
September 25 » Columbia University Graduate School of Journalism is founded in New York City.
October 18 » First Balkan War: King Peter I of Serbia issues a declaration "To the Serbian People", as his country joins the war.
October 24 » First Balkan War: The Battle of Kirk Kilisse concludes with a Bulgarian victory against the Ottoman Empire.
October 24 » First Balkan War: The Battle of Kumanovo concludes with the Serbian victory against the Ottoman Empire.
Day of marriage December 29, 1934
The temperature on December 29, 1934 was between 6.1 °C and 9.9 °C and averaged 7.9 °C. There was 1.5 mm of rain during 2.3 hours. There was 1.1 hours of sunshine (14%). The average windspeed was 5 Bft (very strong wind) and was prevailing from the south-southwest. Source: KNMI
January 26 » German–Polish Non-Aggression Pact is signed.
April 21 » The "Surgeon's Photograph", the most famous photo allegedly showing the Loch Ness Monster, is published in the Daily Mail (in 1999, it is revealed to be a hoax).
May 28 » Near Callander, Ontario, Canada, the Dionne quintuplets are born to Oliva and Elzire Dionne; they will be the first quintuplets to survive infancy.
June 15 » The United States Great Smoky Mountains National Park is founded.
July 20 » Labor unrest in the U.S.: Police in Minneapolis fire upon striking truck drivers, during the Minneapolis Teamsters Strike of 1934, killing two and wounding sixty-seven.
September 18 » The Soviet Union is admitted to the League of Nations.
Day of death May 4, 1971
The temperature on May 4, 1971 was between 2.3 °C and 18.5 °C and averaged 12.2 °C. There was 8.5 hours of sunshine (56%). The partly clouded was. The average windspeed was 2 Bft (weak wind) and was prevailing from the east-northeast. Source: KNMI
April 19 » Launch of Salyut 1, the first space station.
April 23 » Bangladesh Liberation War: The Pakistan Army and Razakars massacre approximately 3,000 Hindu emigrants in the Jathibhanga area of East Pakistan (now Bangladesh).
May 27 » The Dahlerau train disaster, the worst railway accident in West Germany, kills 46 people and injures 25 near Wuppertal.
June 30 » The crew of the Soviet Soyuz 11 spacecraft are killed when their air supply escapes through a faulty valve.
August 5 » The first Pacific Islands Forum (then known as the "South Pacific Forum") is held in Wellington, New Zealand, with the aim of enhancing cooperation between the independent countries of the Pacific Ocean.
September 21 » Bahrain, Bhutan and Qatar join the United Nations.
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/I153174.php : accessed February 24, 2026), "Jan Hartman (1912-1971)".
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