January 2 » American statesman and diplomat John Hay announces the Open Door Policy to promote trade with China.
March 18 » AFC Ajax Amsterdam, The Netherlands's biggest and most successful football club, was founded.
June 20 » Boxer Rebellion: The Imperial Chinese Army begins a 55-day siege of the Legation Quarter in Beijing, China.
October 19 » Max Planck discovers Planck's law of black-body radiation.
October 25 » The United Kingdom annexes the Transvaal.
December 14 » Quantum mechanics: Max Planck presents a theoretical derivation of his black-body radiation law.
Day of death June 4, 1990
The temperature on June 4, 1990 was between 10.4 °C and 15.3 °C and averaged 12.3 °C. There was 2.0 mm of rain during 2.1 hours. There was 3.0 hours of sunshine (18%). The heavily clouded was. The average windspeed was 3 Bft (moderate breeze) and was prevailing from the west. 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.
March 27 » The United States begins broadcasting anti-Castro propaganda to Cuba on TV Martí.
April 4 » The current flag of Hong Kong is adopted for post-colonial Hong Kong during the Third Session of the Seventh National People's Congress.
May 13 » The Dinamo–Red Star riot took place at Maksimir Stadium in Zagreb, Croatia between the Bad Blue Boys (fans of Dinamo Zagreb) and the Delije (fans of Red Star Belgrade).
June 20 » Asteroid Eureka is discovered.
July 1 » German reunification: East Germany accepts the Deutsche Mark as its currency, thus uniting the economies of East and West Germany.
September 20 » South Ossetia declares its 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/I208792.php : accessed October 6, 2026), "Anne Hamstra (1900-1990)".
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