January 2 » American statesman and diplomat John Hay announces the Open Door Policy to promote trade with China.
January 31 » Datu Muhammad Salleh is killed in Kampung Teboh, Tambunan, ending the Mat Salleh Rebellion.
February 7 » A Chinese immigrant in San Francisco falls ill to bubonic plague in the first plague epidemic in the continental United States.
April 14 » The Exposition Universelle begins.
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.
Day of death June 28, 1980
The temperature on June 28, 1980 was between 9.5 °C and 13.2 °C and averaged 12.0 °C. There was 5.8 mm of rain during 7.0 hours. The almost completely overcast was. The average windspeed was 2 Bft (weak wind) and was prevailing from the south. 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.
June 10 » The African National Congress in South Africa publishes a call to fight from their imprisoned leader Nelson Mandela.
July 29 » Iran adopts a new "holy" flag after the Islamic Revolution.
August 14 » Lech Wałęsa leads strikes at the Gdańsk, Poland shipyards.
August 26 » After John Birges plants a bomb at Harvey's Resort Hotel in Stateline, Nevada, in the United States, the FBI inadvertently detonates the bomb during its disarming.
October 25 » Proceedings on the Hague Convention on the Civil Aspects of International Child Abduction conclude.
November 28 » Iran–Iraq War: Operation Morvarid: The bulk of the Iraqi Navy is destroyed by the Iranian Navy in the Persian Gulf. (Commemorated in Iran as Navy Day.)
When copying data from this family tree, please include a reference to the origin: Mark Apeldoorn, "Mark Apeldoorn Family Tree", database, Genealogy Online (https://www.genealogieonline.nl/mark-apeldoorn-family-tree/P1479.php : accessed May 12, 2025), "Williamina Kidd (1900-1980)".
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