The temperature on April 4, 1911 was between -3.0 °C and 6.3 °C and averaged 1.6 °C. There was 1.0 mm of rain. There was 8.4 hours of sunshine (64%). The average windspeed was 3 Bft (moderate breeze) and was prevailing from the northeast. Source: KNMI
January 26 » Glenn Curtiss flies the first successful American seaplane.
March 29 » The M1911 .45 ACP pistol becomes the official U.S. Army side arm.
July 7 » The United States, UK, Japan, and Russia sign the North Pacific Fur Seal Convention of 1911 banning open-water seal hunting, the first international treaty to address wildlife preservation issues.
September 24 » His Majesty's Airship No. 1, Britain's first rigid airship, is wrecked by strong winds before her maiden flight at Barrow-in-Furness.
October 5 » The Kowloon–Canton Railway commences service.
December 24 » Lackawanna Cut-Off railway line opens in New Jersey and Pennsylvania.
Day of marriage December 5, 1935
The temperature on December 5, 1935 was between 0.2 °C and 4.7 °C and averaged 2.3 °C. There was 0.9 mm of rain during 1.8 hours. There was 2.4 hours of sunshine (30%). The average windspeed was 2 Bft (weak wind) and was prevailing from the west. Source: KNMI
February 2 » Leonarde Keeler administers polygraph tests to two murder suspects, the first time polygraph evidence was admitted in U.S. courts.
June 10 » Chaco War ends: A truce is called between Bolivia and Paraguay who had been fighting since 1932.
June 11 » Inventor Edwin Armstrong gives the first public demonstration of FM broadcasting in the United States at Alpine, New Jersey.
June 25 » Colombia–Soviet Union relations are established.
July 5 » The National Labor Relations Act, which governs labor relations in the United States, is signed into law by President Franklin D. Roosevelt.
December 12 » Lebensborn Project, a Nazi reproduction program, is founded by Heinrich Himmler.
Day of death October 13, 1977
The temperature on October 13, 1977 was between 5.3 °C and 17.0 °C and averaged 10.9 °C. There was -0.1 mm of rain. There was 7.3 hours of sunshine (67%). The partly clouded was. The average windspeed was 1 Bft (weak wind) and was prevailing from the south-southwest. Source: KNMI
In The Netherlands , there was from Friday, May 11, 1973 to Monday, December 19, 1977 the cabinet Den Uyl, with Drs. J.M. den Uyl (PvdA) as prime minister.
In The Netherlands , there was from Monday, December 19, 1977 to Friday, September 11, 1981 the cabinet Van Agt I, with Mr. A.A.M. van Agt (CDA/KVP) as prime minister.
May 18 » Likud party wins the 1977 Israeli legislative election, with Menachem Begin, its founder, as the sixth Prime Minister of Israel.
September 18 » Voyager I takes the first distant photograph of the Earth and the Moon together.
October 17 » The hijacked Lufthansa Flight 181 lands in Mogadishu. The remaining hostages are later rescued.
November 8 » Manolis Andronikos, a Greek archaeologist and professor at the Aristotle University of Thessaloniki, discovers the tomb of Philip II of Macedon at Vergina.
November 11 » A munitions explosion at a train station in Iri, South Korea kills at least 56 people.
December 4 » Malaysian Airline System Flight 653 is hijacked and crashes in Tanjong Kupang, Johor, killing 100.
When copying data from this family tree, please include a reference to the origin: Wicher Dam, "Dambomen, negen verschillende stambomen DAM", database, Genealogy Online (https://www.genealogieonline.nl/dambomen/I17631.php : accessed March 8, 2026), "Roelof Koehoorn (1911-1977)".
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