The temperature on April 7, 1891 was about 4.7 °C. There was 5 mm of rain. The air pressure was 8 kgf/m2 and came mainly from the north-northwest. The airpressure was 75 cm mercury. The atmospheric humidity was 98%. Source: KNMI
In The Netherlands , there was from April 21, 1888 to August 21, 1891 the cabinet Mackay, with Mr. A. baron Mackay (AR) as prime minister.
In The Netherlands , there was from August 21, 1891 to May 9, 1894 the cabinet Van Tienhoven, with Mr. G. van Tienhoven (unie-liberaal) as prime minister.
January 31 » History of Portugal: The first attempt at a Portuguese republican revolution breaks out in the northern city of Porto.
April 1 » The Wrigley Company is founded in Chicago, Illinois.
May 15 » Pope Leo XIII defends workers' rights and property rights in the encyclical Rerum novarum, the beginning of modern Catholic social teaching.
May 16 » The International Electrotechnical Exhibition opens in Frankfurt, Germany, and will feature the world's first long-distance transmission of high-power, three-phase electric current (the most common form today).
May 20 » History of cinema: The first public display of Thomas Edison's prototype kinetoscope.
August 18 » Major hurricane strikes Martinique, leaving 700 dead.
Day of marriage April 23, 1912
The temperature on April 23, 1912 was between 5.8 °C and 19.1 °C and averaged 12.2 °C. There was 12.1 hours of sunshine (84%). The average windspeed was 4 Bft (moderate breeze) and was prevailing from the northeast. Source: KNMI
January 6 » German geophysicist Alfred Wegener first presents his theory of continental drift.
January 8 » The African National Congress is founded, under the name South African Native National Congress (SANNC).
April 17 » Russian troops open fire on striking goldfield workers in northeast Siberia, killing at least 150.
May 5 » Pravda, the "voice" of the Communist Party of the Soviet Union, begins publication in Saint Petersburg.
October 24 » First Balkan War: The Battle of Kumanovo concludes with the Serbian victory against the Ottoman Empire.
December 6 » The Nefertiti Bust is discovered.
Day of death April 12, 1964
The temperature on April 12, 1964 was between 3.4 °C and 9.8 °C and averaged 7.8 °C. There was 7.4 mm of rain during 10.3 hours. The heavily clouded was. The average windspeed was 4 Bft (moderate breeze) and was prevailing from the southwest. Source: KNMI
January 12 » Rebels in Zanzibar begin a revolt known as the Zanzibar Revolution and proclaim a republic.
March 27 » The Good Friday earthquake, the most powerful earthquake recorded in North American history at a magnitude of 9.2 strikes Southcentral Alaska, killing 125 people and inflicting massive damage to the city of Anchorage.
May 2 » First ascent of Shishapangma, the fourteenth highest mountain in the world and the lowest of the Eight-thousanders.
June 5 » DSV Alvin is commissioned.
June 11 » World War II veteran Walter Seifert attacks an elementary school in Cologne, Germany, killing at least eight children and two teachers and seriously injuring several more with a home-made flamethrower and a lance.
October 14 » The Soviet Presidium and the Communist Party Central Committee each vote to accept Nikita Khrushchev's "voluntary" request to retire from his offices.
When copying data from this family tree, please include a reference to the origin: K. Groot, "Genealogy Groot", database, Genealogy Online (https://www.genealogieonline.nl/genealogie-groot/I1685.php : accessed February 27, 2026), "Johanna Groot (1891-1964)".
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