The temperature on February 23, 1911 was between 6.1 °C and 9.5 °C and averaged 7.8 °C. There was 4.0 mm of rain. There was 0.6 hours of sunshine (6%). The average windspeed was 6 Bft (strong wind) and was prevailing from the southwest. Source: KNMI
January 5 » Kappa Alpha Psi, the world's third oldest and largest black fraternity, is founded at Indiana University.
February 18 » The first official flight with airmail takes place from Allahabad, United Provinces, British India (now India), when Henri Pequet, a 23-year-old pilot, delivers 6,500 letters to Naini, about 10 kilometres (6.2mi) away.
April 8 » Dutch physicist Heike Kamerlingh Onnes discovers superconductivity.
April 27 » Following the resignation and death of William P. Frye, a compromise is reached to rotate the office of President pro tempore of the United States Senate.
June 22 » Mexican Revolution: Government forces bring an end to the Magonista rebellion of 1911 in the Second Battle of Tijuana.
October 5 » The Kowloon–Canton Railway commences service.
Day of death February 28, 1960
The temperature on February 28, 1960 was between 4.9 °C and 16.5 °C and averaged 10.4 °C. There was 0.2 hours of sunshine (2%). The partly or heavily clouded was. The average windspeed was 4 Bft (moderate breeze) and was prevailing from the southwest. Source: KNMI
January 19 » Japan and the United States sign the US–Japan Mutual Security Treaty
April 8 » The Netherlands and West Germany sign an agreement to negotiate the return of German land annexed by the Dutch in return for 280million German marks as Wiedergutmachung.
July 1 » Independence of Somalia.
August 6 » Cuban Revolution: Cuba nationalizes American and foreign-owned property in the nation.
August 7 » Ivory Coast becomes independent from France.
August 20 » Senegal breaks from the Mali Federation, declaring its independence.
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/I477303.php : accessed January 25, 2026), "Marinus Koppe (± 1885-1960)".
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