The temperature on April 1, 1947 was between 3.0 °C and 9.2 °C and averaged 6.4 °C. There was 6.9 mm of rain during 4.3 hours. There was 0.2 hours of sunshine (2%). The average windspeed was 2 Bft (weak wind) and was prevailing from the south-southwest. Source: KNMI
March 17 » First flight of the B-45 Tornado strategic bomber.
April 1 » The only mutiny in the history of the Royal New Zealand Navy begins.
May 31 » Ferenc Nagy, the democratically elected Prime Minister of Hungary, resigns from office after blackmail from the Hungarian Communist Party accusing him of being part of a plot against the state. This grants the Communists effective control of the Hungarian government.
June 24 » Kenneth Arnold makes the first widely reported UFO sighting near Mount Rainier, Washington, leading to the coining of the phrase "flying saucer".
August 7 » The Bombay Municipal Corporation formally takes over the Bombay Electric Supply and Transport (BEST).
November 30 » Civil War in Mandatory Palestine begins, leading up to the creation of the state of Israel.
When copying data from this family tree, please include a reference to the origin: Hendrik Dreyer, "Dreyer Tree", database, Genealogy Online (https://www.genealogieonline.nl/dreyer-tree/I4019.php : accessed January 19, 2026), "Hendrik Jan Haak (1909-)".
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