The temperature on May 30, 1947 was between 12.6 °C and 26.4 °C and averaged 20.4 °C. There was 13.8 hours of sunshine (85%). The average windspeed was 3 Bft (moderate breeze) and was prevailing from the east-southeast. Source: KNMI
June 24 » Kenneth Arnold makes the first widely reported UFO sighting near Mount Rainier, Washington, leading to the coining of the phrase "flying saucer".
July 8 » Reports are broadcast that a UFO crash landed in Roswell, New Mexico in what became known as the Roswell UFO incident.
September 18 » The National Security Council and the Central Intelligence Agency are established in the United States by the National Security Act. It also establishes the Air Force as an equal partner of the Army and Navy.
October 30 » The General Agreement on Tariffs and Trade (GATT), the foundation of the World Trade Organization (WTO), is founded.
December 17 » First flight of the Boeing B-47 Stratojet strategic bomber.
Day of marriage November 25, 1970
The temperature on November 25, 1970 was between 3.5 °C and 10.9 °C and averaged 6.5 °C. There was 7.1 hours of sunshine (85%). The almost cloudless was. The average windspeed was 3 Bft (moderate breeze) and was prevailing from the south-southeast. Source: KNMI
When copying data from this family tree, please include a reference to the origin: J Eijsermans, "Eijsermans family tree", database, Genealogy Online (https://www.genealogieonline.nl/stamboom-eijsermans/I163967.php : accessed March 13, 2026), "Johannes Laurentius "Jan" van der Avoird (1947-)".
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