The temperature on May 12, 1957 was between 9.3 °C and 16.9 °C and averaged 12.5 °C. There was 10.3 mm of rain during 1.2 hours. There was 6.5 hours of sunshine (42%). The partly clouded was. The average windspeed was 4 Bft (moderate breeze) and was prevailing from the south-southwest. 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.
July 25 » The Tunisian King Muhammad VIII al-Amin is replaced by President Habib Bourguiba.
August 1 » The United States and Canada form the North American Aerospace Defense Command (NORAD).
October 4 » Sputnik 1 becomes the first artificial satellite to orbit the Earth.
December 17 » The United States successfully launches the first Atlas intercontinental ballistic missile at Cape Canaveral, Florida.
When copying data from this family tree, please include a reference to the origin: Joop Klavers, "Family tree Klavers", database, Genealogy Online (https://www.genealogieonline.nl/stamboom_klavers/I366706.php : accessed January 22, 2026), "Cornelis Nicolaas Helmers (1957-2019)".
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