The temperature on April 18, 1911 was between 3.5 °C and 18.8 °C and averaged 12.6 °C. There was 8.0 hours of sunshine (57%). The average windspeed was 4 Bft (moderate breeze) and was prevailing from the south. Source: KNMI
January 5 » Kappa Alpha Psi, the world's third oldest and largest black fraternity, is founded at Indiana University.
January 18 » Eugene B. Ely lands on the deck of the USSPennsylvania anchored in San Francisco Bay, the first time an aircraft landed on a ship.
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.
October 24 » Orville Wright remains in the air nine minutes and 45 seconds in a glider at Kill Devil Hills, North Carolina.
November 11 » Many cities in the Midwestern United States break their record highs and lows on the same day as a strong cold front rolls through.
December 29 » Mongolia gains independence from the Qing dynasty, enthroning 8th Jebtsundamba Khutughtu as Khagan of Mongolia.
When copying data from this family tree, please include a reference to the origin: Henny de Jonge, "Family tree Koolbergen-de Jonge", database, Genealogy Online (https://www.genealogieonline.nl/stamboom-koolbergen-de-jonge/P97.php : accessed June 8, 2024), "Cecilia Gerhardina Koolbergen (1911-)".
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