April 19 » The Kishinev pogrom in Kishinev (Bessarabia) begins, forcing tens of thousands of Jews to later seek refuge in Palestine and the Western world.
August 29 » The Slava, the last of the five Borodino-class battleships, is launched.
October 6 » The High Court of Australia sits for the first time.
November 3 » With the encouragement of the United States, Panama separates from Colombia.
November 18 » The Hay–Bunau-Varilla Treaty is signed by the United States and Panama, giving the United States exclusive rights over the Panama Canal Zone.
December 30 » A fire at the Iroquois Theater in Chicago, Illinois kills at least 605.
Day of death April 20, 1981
The temperature on April 20, 1981 was between 1.3 °C and 11.2 °C and averaged 5.9 °C. There was -0.1 mm of rain. There was 10.9 hours of sunshine (77%). The partly clouded was. The average windspeed was 3 Bft (moderate breeze) and was prevailing from the north-northeast. Source: KNMI
In The Netherlands , there was from Monday, December 19, 1977 to Friday, September 11, 1981 the cabinet Van Agt I, with Mr. A.A.M. van Agt (CDA/KVP) as prime minister.
In The Netherlands , there was from Friday, September 11, 1981 to Saturday, May 29, 1982 the cabinet Van Agt II, with Mr. A.A.M. van Agt (CDA) as prime minister.
January 8 » A local farmer reports a UFO sighting in Trans-en-Provence, France, claimed to be "perhaps the most completely and carefully documented sighting of all time".
March 27 » The Solidarity movement in Poland stages a warning strike, in which at least 12 million Poles walk off their jobs for four hours.
April 3 » The Osborne 1, the first successful portable computer, is unveiled at the West Coast Computer Faire in San Francisco.
April 27 » Xerox PARC introduces the computer mouse.
October 9 » President François Mitterrand abolishes capital punishment in France.
November 11 » Antigua and Barbuda joins the United Nations.
When copying data from this family tree, please include a reference to the origin: Hans Weening, "Family tree Weening", database, Genealogy Online (https://www.genealogieonline.nl/stamboom-weening/I199876.php : accessed February 9, 2026), "Gerrit Jan Cleveringa (1903-1981)".
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