April 2 » Dmitry Sipyagin, Minister of Interior of the Russian Empire, is assassinated in the Marie Palace, Saint Petersburg.
April 14 » James Cash Penney opens his first store in Kemmerer, Wyoming.
April 20 » Pierre and Marie Curie refine radium chloride.
May 17 » Greek archaeologist Valerios Stais discovers the Antikythera mechanism, an ancient mechanical analog computer.
May 20 » Cuba gains independence from the United States. Tomás Estrada Palma becomes the country's first President.
November 21 » The Philadelphia Football Athletics defeated the Kanaweola Athletic Club of Elmira, New York, 39–0, in the first ever professional American football night game.
Day of marriage May 14, 1921
The temperature on May 14, 1921 was between 8.5 °C and 25.0 °C and averaged 16.3 °C. There was 10.5 hours of sunshine (67%). The average windspeed was 2 Bft (weak wind) and was prevailing from the west-northwest. Source: KNMI
In The Netherlands , there was from September 9, 1918 to September 18, 1922 the cabinet Ruys de Beerenbrouck I, with Jonkheer mr. Ch.J.M. Ruys de Beerenbrouck (RKSP) as prime minister.
February 15 » Kingdom of Romania establishes its legation in Helsinki.
February 22 » After Russian forces under Baron Roman von Ungern-Sternberg drive the Chinese out, the Bogd Khan is reinstalled as the emperor of Mongolia.
March 24 » The 1921 Women's Olympiad begins in Monte Carlo, first international women's sports event.
September 21 » A storage silo in Oppau, Germany, explodes, killing 500–600 people.
October 18 » The Crimean Autonomous Soviet Socialist Republic is formed as part of the Russian Soviet Federative Socialist Republic.
November 14 » The Communist Party of Spain is founded, and issues the first edition of Mundo obrero.
Day of death June 21, 1997
The temperature on June 21, 1997 was between 12.8 °C and 19.4 °C and averaged 15.3 °C. There was 3.9 mm of rain during 3.4 hours. There was 3.9 hours of sunshine (23%). The partly or heavily clouded was. The average windspeed was 3 Bft (moderate breeze) and was prevailing from the south-southwest. Source: KNMI
In The Netherlands , there was from Monday, August 22, 1994 to Monday, August 3, 1998 the cabinet a href="https://nl.wikipedia.org/wiki/Kabinet-Kok_I" class="extern">Kok I, with W. Kok (PvdA) as prime minister.
March 22 » Tara Lipinski, aged 14 years and nine months, becomes the youngest women's World Figure Skating Champion.
July 5 » Sri Lankan Civil War: Sri Lankan Tamil MP A. Thangathurai is shot dead at Sri Shanmuga Hindu Ladies College in Trincomalee.
August 10 » Sixteen people are killed when Formosa Airlines Flight 7601 crashes near Beigan Airport in the Matsu Islands of Taiwan.
September 19 » The Guelb El-Kebir massacre in Algeria kills 53 people.
October 25 » After a civil war, Denis Sassou Nguesso proclaims himself President of the Republic of the Congo.
December 22 » Hussein Farrah Aidid relinquishes the disputed title of President of Somalia by signing the Cairo Declaration, in Cairo, Egypt. It is the first major step towards reconciliation in Somalia since 1991.
When copying data from this family tree, please include a reference to the origin: P. Heres, "Family tree Apool", database, Genealogy Online (https://www.genealogieonline.nl/stamboom-apool/I1099522575.php : accessed March 2, 2026), "Siena Okkerse (1902-1997)".
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