The temperature on April 17, 1947 was between 5.3 °C and 15.7 °C and averaged 10.3 °C. There was 0.3 mm of rain during 0.4 hours. There was 7.6 hours of sunshine (54%). The average windspeed was 3 Bft (moderate breeze) and was prevailing from the north-northeast. Source: KNMI
February 21 » In New York City, Edwin Land demonstrates the first "instant camera", the Polaroid Land Camera, to a meeting of the Optical Society of America.
April 6 » The first Tony Awards are presented for theatrical achievement.
June 5 » Cold War: Marshall Plan: In a speech at Harvard University, the United States Secretary of State George Marshall calls for economic aid to war-torn Europe.
August 2 » A British South American Airways Avro Lancastrian airliner crashes into a mountain during a flight from Buenos Aires, Argentina to Santiago, Chile. The wreckage would not be found until 1998.
August 4 » The Supreme Court of Japan is established.
August 7 » Thor Heyerdahl's balsa wood raft, the Kon-Tiki, smashes into the reef at Raroia in the Tuamotu Islands after a 101-day, 7,000 kilometres (4,300mi) journey across the Pacific Ocean in an attempt to prove that pre-historic peoples could have traveled from South America.
When copying data from this family tree, please include a reference to the origin: Kees Neeft, "Cousin's Family Tree", database, Genealogy Online (https://www.genealogieonline.nl/stamboom-neeft/I63.php : accessed February 20, 2026), "Jan Daniël Rijkmans (1947-2022)".
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