January 2 » American statesman and diplomat John Hay announces the Open Door Policy to promote trade with China.
April 2 » The United States Congress passes the Foraker Act, giving Puerto Rico limited self-rule.
June 5 » Second Boer War: British soldiers take Pretoria.
September 17 » Philippine–American War: Filipinos under Juan Cailles defeat Americans under Colonel Benjamin F. Cheatham Jr. at Mabitac.
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 marriage May 27, 1927
The temperature on May 27, 1927 was between 2.7 °C and 13.2 °C and averaged 8.2 °C. There was 0.1 mm of rain. There was 6.8 hours of sunshine (42%). The average windspeed was 3 Bft (moderate breeze) and was prevailing from the northwest. Source: KNMI
January 1 » New Mexican oil legislation goes into effect, leading to the formal outbreak of the Cristero War.
February 23 » German theoretical physicist Werner Heisenberg writes a letter to fellow physicist Wolfgang Pauli, in which he describes his uncertainty principle for the first time.
May 9 » Old Parliament House, Canberra officially opens.
July 24 » The Menin Gate war memorial is unveiled at Ypres.
September 18 » The Columbia Broadcasting System goes on the air.
October 4 » Gutzon Borglum begins sculpting Mount Rushmore.
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/I208760.php : accessed October 24, 2026), "Wiebe Pieter Penninga (1900-)".
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