April 2 » The United States Congress passes the Foraker Act, giving Puerto Rico limited self-rule.
June 14 » The second German Naval Law calls for the Imperial German Navy to be doubled in size, resulting in an Anglo-German naval arms race.
July 19 » The first line of the Paris Métro opens for operation.
October 19 » Max Planck discovers Planck's law of black-body radiation.
December 14 » Quantum mechanics: Max Planck presents a theoretical derivation of his black-body radiation law.
December 19 » Hopetoun Blunder: The first Governor-General of Australia John Hope, 7th Earl of Hopetoun, appoints Sir William Lyne premier of the new state of New South Wales, but he is unable to persuade other colonial politicians to join his government and is forced to resign.
Day of death May 13, 1991
The temperature on May 13, 1991 was between 5.6 °C and 16.1 °C and averaged 12.0 °C. There was 2.9 mm of rain during 3.0 hours. There was 0.1 hours of sunshine (1%). The heavily clouded was. The average windspeed was 2 Bft (weak wind) and was prevailing from the west-southwest. Source: KNMI
In The Netherlands , there was from Tuesday, November 7, 1989 to Monday, August 22, 1994 the cabinet Lubbers III, with Drs. R.F.M. Lubbers (CDA) as prime minister.
April 4 » Senator John Heinz of Pennsylvania and six others are killed when a helicopter collides with their airplane over an elementary school in Merion, Pennsylvania.
June 3 » Mount Unzen erupts in Kyūshū, Japan, killing 43 people, all of them either researchers or journalists.
August 29 » Supreme Soviet of the Soviet Union suspends all activities of the Soviet Communist Party.
September 8 » The Republic of Macedonia becomes independent.
October 8 » Upon the expiration of the Brioni Agreement, Croatia and Slovenia sever all official relations with Yugoslavia.
November 28 » South Ossetia declares independence from Georgia.
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/I137157.php : accessed October 17, 2026), "Trijntje de Jong (1900-1991)".
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