The temperature on March 23, 1957 was between 6.6 °C and 12.6 °C and averaged 9.6 °C. There was 2.8 mm of rain during 2.5 hours. The partly or heavily clouded was. The average windspeed was 4 Bft (moderate breeze) and was prevailing from the east. Source: KNMI
January 23 » American inventor Walter Frederick Morrison sells the rights to his flying disc to the Wham-O toy company, which later renames it the "Frisbee".
May 1 » Thirty-four people are killed when a Vickers Viking airliner crashes in Hampshire, England.
May 3 » Walter O'Malley, the owner of the Brooklyn Dodgers, agrees to move the team from Brooklyn to Los Angeles.
July 6 » Althea Gibson wins the Wimbledon championships, becoming the first black athlete to do so.
July 11 » Prince Karim Husseini Aga Khan IV inherits the office of Imamat as the 49th Imam of Shia Imami Ismai'li worldwide, after the death of Sir Sultan Mahommed Shah Aga Khan III.
September 19 » Plumbbob Rainier becomes the first nuclear explosion to be entirely contained underground, producing no fallout.
When copying data from this family tree, please include a reference to the origin: Robert de Rooij, "Family tree de Rooij", database, Genealogy Online (https://www.genealogieonline.nl/stamboom_de_rooij/I16396.php : accessed March 18, 2026), "Johan Rudolf Planken (1957-2023)".
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