April 18 » The Greco-Turkish War is declared between Greece and the Ottoman Empire.
August 2 » Anglo-Afghan War: The Siege of Malakand ends when a relief column is able to reach the British garrison in the Malakand states.
August 10 » German chemist Felix Hoffmann discovers an improved way of synthesizing acetylsalicylic acid (aspirin).
August 21 » Oldsmobile, an American automobile manufacturer and marque, is founded.
September 10 » Lattimer massacre: A sheriff's posse kills 19 unarmed striking immigrant miners in Lattimer, Pennsylvania, United States.
December 6 » London becomes the world's first city to host licensed taxicabs.
Day of death April 20, 1998
The temperature on April 20, 1998 was between 7.3 °C and 13.7 °C and averaged 9.6 °C. There was 5.2 mm of rain during 3.1 hours. There was 0.6 hours of sunshine (4%). The 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.
In The Netherlands , there was from Monday, August 3, 1998 to Monday, July 22, 2002 the cabinet Kok II, with W. Kok (PvdA) as prime minister.
February 1 » Rear Admiral Lillian E. Fishburne becomes the first female African American to be promoted to rear admiral.
February 3 » Cavalese cable car disaster: a United States military pilot causes the death of 20 people when his low-flying plane cuts the cable of a cable-car near Trento, Italy.
April 6 » Nuclear weapons testing: Pakistan tests medium-range missiles capable of reaching India.
August 20 » The Supreme Court of Canada rules that Quebec cannot legally secede from Canada without the federal government's approval.
September 2 » Swissair Flight 111 crashes near Peggy's Cove, Nova Scotia; all 229 people onboard are killed.
December 6 » in Venezuela, Hugo Chávez is victorious in presidential elections.
When copying data from this family tree, please include a reference to the origin: Wilfried Celis, "Family tree Celis", database, Genealogy Online (https://www.genealogieonline.nl/stamboom-celis/I413.php : accessed January 3, 2026), "Petrus Ludovicus CELIS (1897-1998)".
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