The temperature on March 15, 1889 was about -1.3 °C. The air pressure was 22 kgf/m2 and came mainly from the northeast. The airpressure was 77 cm mercury. The atmospheric humidity was 86%. Source: KNMI
January 8 » Herman Hollerith is issued US patent #395,791 for the 'Art of Applying Statistics' — his punched card calculator.
April 1 » The University of Northern Colorado was established, as the Colorado State Normal School.
June 6 » The Great Seattle Fire destroys all of downtown Seattle.
July 8 » The first issue of The Wall Street Journal is published.
August 4 » The Great Fire of Spokane, Washington destroys some 32 blocks of the city, prompting a mass rebuilding project.
September 23 » Nintendo Koppai (Later Nintendo Company, Limited) is founded by Fusajiro Yamauchi to produce and market the playing card game Hanafuda.
Day of marriage February 5, 1912
The temperature on February 5, 1912 was between -15.6 °C and -3.8 °C and averaged -9.9 °C. There was 7.0 hours of sunshine (75%). The average windspeed was 3 Bft (moderate breeze) and was prevailing from the east. Source: KNMI
January 5 » The 6th All-Russian Conference of the Russian Social Democratic Labour Party (Prague Party Conference) opens. In the course of the conference, Vladimir Lenin and his supporters break from the rest of the party to form the Bolshevik movement.
February 29 » The Piedra Movediza (Moving Stone) of Tandil falls and breaks.
April 16 » Harriet Quimby becomes the first woman to fly an airplane across the English Channel.
September 25 » Columbia University Graduate School of Journalism is founded in New York City.
November 12 » The frozen bodies of Robert Scott and his men are found on the Ross Ice Shelf in Antarctica.
November 27 » Spain declares a protectorate over the north shore of Morocco.
Day of death May 6, 1968
The temperature on May 6, 1968 was between 4.0 °C and 13.1 °C and averaged 8.9 °C. There was 4.9 mm of rain during 2.0 hours. The heavily clouded was. The average windspeed was 1 Bft (weak wind) and was prevailing from the south-southeast. Source: KNMI
March 16 » Vietnam War: My Lai Massacre occurs; between 347 and 500 Vietnamese villagers (men, women, and children) are killed by American troops.
April 4 » Apollo program: NASA launches Apollo 6.
April 6 » Pierre Elliott Trudeau wins the Liberal Leadership Election, and becomes Prime Minister of Canada soon after.
May 12 » Vietnam War: North Vietnamese and Viet Cong forces attack Australian troops defending Fire Support Base Coral.
December 20 » The Zodiac Killer kills Betty Lou Jenson and David Faraday in Vallejo, California.
December 25 » Kilvenmani massacre: Forty-four Dalits (untouchables) are burnt to death in Kizhavenmani village, Tamil Nadu, a retaliation for a campaign for higher wages by Dalit laborers.
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/I3564.php : accessed February 5, 2026), "Gerardus de Nijs (1889-1968)".
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