The temperature on January 4, 1889 was about -3.0 °C. The air pressure was 4 kgf/m2 and came mainly from the east. The airpressure was 78 cm mercury. The atmospheric humidity was 94%. Source: KNMI
January 30 » Archduke Crown Prince Rudolf of Austria, heir to the Austro-Hungarian crown, is found dead with his mistress Baroness Mary Vetsera in the Mayerling.
March 23 » The Ahmadiyya Muslim Community is established by Mirza Ghulam Ahmad in Qadian, British India.
March 31 » The Eiffel Tower is officially opened.
April 1 » The University of Northern Colorado was established, as the Colorado State Normal School.
May 11 » An attack upon a U.S. Army paymaster and escort results in the theft of over $28,000 and the award of two Medals of Honor.
October 24 » Henry Parkes delivers the Tenterfield Oration, effectively starting the federation process in Australia.
Day of marriage November 19, 1910
The temperature on November 19, 1910 was between -2.4 °C and 6.9 °C and averaged 2.2 °C. There was 0.1 mm of rain. There was 4.5 hours of sunshine (52%). The average windspeed was 2 Bft (weak wind) and was prevailing from the northwest. Source: KNMI
February 8 » The Boy Scouts of America is incorporated by William D. Boyce.
March 3 » Rockefeller Foundation: John D. Rockefeller Jr. announces his retirement from managing his businesses so that he can devote all his time to philanthropy.
May 11 » An act of the U.S. Congress establishes Glacier National Park in Montana.
June 19 » The first Father's Day is celebrated in Spokane, Washington.
August 22 » Korea is annexed by Japan with the signing of the Japan–Korea Treaty of 1910, beginning a period of Japanese rule of Korea that lasted until the end of World War II.
September 22 » The Duke of York's Picture House opens in Brighton, now the oldest continually operating cinema in Britain.
When copying data from this family tree, please include a reference to the origin: Gert Pieters, "Family tree Koops", database, Genealogy Online (https://www.genealogieonline.nl/stamboom-koops/I37.php : accessed February 23, 2026), "Roelofje de Boer (1889-????)".
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