The temperature on October 27, 1881 was about 6.2 °C. The air pressure was 1 kgf/m2 and came mainly from the north-northeast. The airpressure was 77 cm mercury. The atmospheric humidity was 62%. Source: KNMI
In The Netherlands , there was from August 20, 1879 to April 23, 1883 the cabinet Van Lijnden van Sandenburg, with Mr. C.Th. baron Van Lijnden van Sandenburg (conservatief-AR) as prime minister.
February 24 » China and Russia sign the Sino-Russian Ili Treaty.
April 11 » Spelman College is founded in Atlanta, Georgia as the Atlanta Baptist Female Seminary, an institute of higher education for African-American women.
July 1 » General Order 70, the culmination of the Cardwell and Childers reforms of the British Army, comes into effect.
July 23 » The Boundary Treaty of 1881 between Chile and Argentina is signed in Buenos Aires.
August 27 » The Georgia hurricane makes landfall near Savannah, Georgia, resulting in an estimated 700 deaths.
September 20 » U.S. President Chester A. Arthur is sworn in, the morning after becoming President upon James A. Garfield's death.
Day of marriage June 8, 1905
The temperature on June 8, 1905 was between 8.0 °C and 13.7 °C and averaged 10.8 °C. The average windspeed was 4 Bft (moderate breeze) and was prevailing from the northeast. Source: KNMI
In The Netherlands , there was from August 1, 1901 to August 16, 1905 the cabinet Kuijper, with Dr. A. Kuijper (AR) as prime minister.
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.
January 26 » The world's largest diamond ever, the Cullinan weighing 3,106.75 carats (0.621350kg), is found at the Premier Mine near Pretoria in South Africa.
April 30 » Albert Einstein completes his doctoral thesis at the University of Zurich.
June 7 » Norway's parliament dissolves its union with Sweden. The vote was confirmed by a national plebiscite on August 13 of that year.
August 10 » Russo-Japanese War: Peace negotiations begin in Portsmouth, New Hampshire.
September 1 » Alberta and Saskatchewan join the Canadian confederation.
November 28 » Irish nationalist Arthur Griffith founds Sinn Féin as a political party with the main aim of establishing a dual monarchy in Ireland.
Day of death April 9, 1954
The temperature on April 9, 1954 was between 0.5 °C and 13.0 °C and averaged 6.8 °C. There was 11.5 hours of sunshine (85%). The almost cloudless was. The average windspeed was 3 Bft (moderate breeze) and was prevailing from the east-northeast. Source: KNMI
March 26 » Nuclear weapons testing: The Romeo shot of Operation Castle is detonated at Bikini Atoll. Yield: 11 megatons.
May 17 » The United States Supreme Court hands down a unanimous decision in Brown v. Board of Education of Topeka, Kansas, outlawing racial segregation in public schools.
August 23 » First flight of the Lockheed C-130 multi-role aircraft.
October 10 » The Minister of Foreign Affairs of the Sultanate of Muscat, Neil Innes, sends a signal to the Sultanate's forces, accompanied with oil explorers, to penetrate Fahud, marking the beginning of Jebel Akhdar War between the Imamate of Oman and the Sultanate of Muscat.
December 2 » Cold War: The United States Senate votes 65 to 22 to censure Joseph McCarthy for "conduct that tends to bring the Senate into dishonor and disrepute".
December 23 » First successful kidney transplant is performed by J. Hartwell Harrison and Joseph Murray.
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/I271.php : accessed February 22, 2026), "Maria van Helvert (1881-1954)".
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