The temperature on April 10, 1885 was about 6.3 °C. The air pressure was 2 kgf/m2 and came mainly from the west-southwest. The airpressure was 75 cm mercury. The atmospheric humidity was 92%. Source: KNMI
In The Netherlands , there was from April 23, 1884 to April 21, 1888 the cabinet Heemskerk, with Mr. J. Heemskerk Azn. (conservatief) as prime minister.
January 1 » Twenty-five nations adopt Sandford Fleming's proposal for standard time (and also, time zones).
January 4 » Sino-French War: French troops under General Oscar de Négrier defeat a numerically superior Qing force at Núi Bop in northern Vietnam.
April 2 » Canadian Cree warriors attack the village of Frog Lake, killing nine.
May 1 » The original Chicago Board of Trade Building opens for business.
September 2 » Rock Springs massacre: In Rock Springs, Wyoming, 150 white miners, who are struggling to unionize so they could strike for better wages and work conditions, attack their Chinese fellow workers killing 28, wounding 15 and forcing several hundred more out of town.
December 28 » Indian National Congress, a political party of India, is founded in Bombay Presidency, British India.
Day of marriage February 21, 1906
The temperature on February 21, 1906 was between 1.9 °C and 6.7 °C and averaged 3.8 °C. There was 4.4 mm of rain. There was 1.0 hours of sunshine (10%). The average windspeed was 4 Bft (moderate breeze) and was prevailing from the west-northwest. Source: KNMI
In The Netherlands , there was from August 17, 1905 to February 11, 1908 the cabinet De Meester, with Mr. Th. de Meester (unie-liberaal) as prime minister.
February 18 » Édouard de Laveleye forms the Belgian Olympic Committee in Brussels.
May 2 » Closing ceremony of the Intercalated Games in Athens, Greece.
September 5 » The first legal forward pass in American football is thrown by Bradbury Robinson of St. Louis University to teammate Jack Schneider in a 22–0 victory over Carroll College (Wisconsin).
September 30 » The Royal Galician Academy, the Galician language's biggest linguistic authority, starts working in La Coruña, Spain.
October 11 » San Francisco sparks a diplomatic crisis between the United States and Japan by ordering segregated schools for Japanese students.
December 30 » The All-India Muslim League is founded in Dacca, East Bengal, British India (later Dhaka, Bangladesh).
Day of death December 28, 1960
The temperature on December 28, 1960 was between -1.5 °C and 3.7 °C and averaged 0.4 °C. There was 0.3 mm of rain. There was 2.4 hours of sunshine (31%). The partly clouded was. The average windspeed was 4 Bft (moderate breeze) and was prevailing from the south-southeast. Source: KNMI
January 23 » The bathyscaphe USS Trieste breaks a depth record by descending to 10,911 metres (35,797ft) in the Pacific Ocean.
May 23 » A tsunami caused by an earthquake in Chile the previous day kills 61 people in Hilo, Hawaii.
September 5 » Poet Léopold Sédar Senghor is the first elected President of Senegal.
September 18 » Fidel Castro arrives in New York City as the head of the Cuban delegation to the United Nations.
December 15 » Richard Pavlick is arrested for plotting to assassinate U.S. President-Elect John F. Kennedy.
December 17 » Troops loyal to Emperor Haile Selassie in Ethiopia crush the coup that began December 13, returning power to their leader upon his return from Brazil. Haile Selassie absolves his son of any guilt.
When copying data from this family tree, please include a reference to the origin: Hans Opperman, "Family tree Opperman", database, Genealogy Online (https://www.genealogieonline.nl/stamboom-opperman/I3487.php : accessed March 7, 2026), "Wilhelmine Louise (Ludovica) Marie Siepkes (1885-1960)".
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