The temperature on June 30, 1957 was between 18.8 °C and 34.2 °C and averaged 26.5 °C. There was 13.6 hours of sunshine (81%). The partly clouded was. The average windspeed was 2 Bft (weak wind) and was prevailing from the south-southeast. 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 15 » At Malden Island in the Pacific Ocean, Britain tests its first hydrogen bomb in Operation Grapple.
July 6 » Althea Gibson wins the Wimbledon championships, becoming the first black athlete to do so.
September 24 » President Eisenhower sends the 101st Airborne Division to Little Rock, Arkansas, to enforce desegregation.
October 3 » The California State Superior Court rules that the book Howl and Other Poems is not obscene.
October 4 » Sputnik 1 becomes the first artificial satellite to orbit the Earth.
Day of death November 30, 2011
The temperature on November 30, 2011 was between 5.0 °C and 10.9 °C and averaged 7.3 °C. There was 6.6 hours of sunshine (81%). The partly clouded was. The average windspeed was 3 Bft (moderate breeze) and was prevailing from the south-southwest. Source: KNMI
In The Netherlands , there was from Thursday, October 14, 2010 to Monday, November 5, 2012 the cabinet Rutte I, with Mark Rutte (VVD) as prime minister.
February 17 » Arab Spring: Libyan protests against Muammar Gaddafi's regime begin. In Bahrain, security forces launched a deadly pre-dawn raid on protesters in Pearl Roundabout in Manama, the day is locally known as Bloody Thursday.
February 22 » New Zealand's second deadliest earthquake strikes Christchurch, killing 185 people.
May 2 » Osama bin Laden, the suspected mastermind behind the September 11 attacks and the FBI's most wanted man, is killed by the United States special forces in Abbottabad, Pakistan.
September 17 » Occupy Wall Street movement begins in Zuccotti Park, New York City.
October 31 » The global population of humans reaches seven billion. This day is now recognized by the United Nations as the Day of Seven Billion.
December 13 » A murder–suicide in Liège, Belgium, kills six and wounds 125 people at a Christmas market.
When copying data from this family tree, please include a reference to the origin: Hendrik de Graaf, "Family tree Plugboer", database, Genealogy Online (https://www.genealogieonline.nl/stamboom-plugboer/I4452.php : accessed February 5, 2026), "Peter Keijsper (1957-2011)".
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