The temperature on May 15, 1911 was between 9.1 °C and 19.1 °C and averaged 14.3 °C. There was 8.7 hours of sunshine (56%). The average windspeed was 2 Bft (weak wind) and was prevailing from the west. Source: KNMI
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.
May 15 » In Standard Oil Co. of New Jersey v. United States, the United States Supreme Court declares Standard Oil to be an "unreasonable" monopoly under the Sherman Antitrust Act and orders the company to be broken up.
May 31 » The President of Mexico Porfirio Díaz flees the country during the Mexican Revolution.
July 24 » Hiram Bingham III re-discovers Machu Picchu, "the Lost City of the Incas".
December 27 » "Jana Gana Mana", the national anthem of India, is first sung in the Calcutta Session of the Indian National Congress.
December 29 » Sun Yat-sen becomes the provisional President of the Republic of China; he formally takes office on January 1, 1912.
Day of death April 3, 1963
The temperature on April 3, 1963 was between 3.9 °C and 7.6 °C and averaged 5.8 °C. The almost completely overcast was. The average windspeed was 1 Bft (weak wind) and was prevailing from the north-northwest. Source: KNMI
January 8 » Leonardo da Vinci's Mona Lisa is exhibited in the United States for the first time, at the National Gallery of Art in Washington, D.C.
January 13 » Coup d'état in Togo results in the assassination of president Sylvanus Olympio.
July 19 » Joe Walker flies a North American X-15 to a record altitude of 106,010 meters (347,800 feet) on X-15 Flight 90. Exceeding an altitude of 100km, this flight qualifies as a human spaceflight under international convention.
July 26 » Syncom 2, the world's first geosynchronous satellite, is launched from Cape Canaveral on a Delta B booster.
August 24 » Buddhist crisis: As a result of the Xá Lợi Pagoda raids, the US State Department cables the United States Embassy, Saigon to encourage Army of the Republic of Vietnam generals to launch a coup against President Ngô Đình Diệm if he did not remove his brother Ngô Đình Nhu.
November 25 » President John F. Kennedy is buried at Arlington National Cemetery in Arlington County, Virginia, across the Potomac River from Washington, D.C.; his assassin, Lee Harvey Oswald, is buried on the same day in Fort Worth, Texas.
When copying data from this family tree, please include a reference to the origin: Jaap Voets, "Family tree Voets", database, Genealogy Online (https://www.genealogieonline.nl/stamboom-voets/I1978.php : accessed March 1, 2026), "Maria Helena "Leen" Bols (1911-1963)".
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