The temperature on December 18, 1887 was about 1.6 °C. There was 6 mm of rain. The air pressure was 15 kgf/m2 and came mainly from the west-southwest. The airpressure was 75 cm mercury. The atmospheric humidity was 98%. Source: KNMI
In The Netherlands , there was from April 23, 1884 to April 21, 1888 the cabinet Heemskerk, with Mr. J. Heemskerk Azn. (conservatief) as prime minister.
January 20 » The United States Senate allows the Navy to lease Pearl Harbor as a naval base.
June 18 » The Reinsurance Treaty between Germany and Russia is signed.
June 23 » The Rocky Mountains Park Act becomes law in Canada creating the nation's first national park, Banff National Park.
July 6 » David Kalākaua, monarch of the Kingdom of Hawaii, is forced to sign the Bayonet Constitution, which transfers much of the king's authority to the Legislature of the Kingdom of Hawaii.
October 1 » Balochistan is conquered by the British Empire.
November 11 » August Spies, Albert Parsons, Adolph Fischer and George Engel are executed as a result of the Haymarket affair.
Day of marriage June 19, 1912
The temperature on June 19, 1912 was between 11.2 °C and 27.0 °C and averaged 19.3 °C. There was 10.5 mm of rain. There was 10.8 hours of sunshine (64%). The average windspeed was 3 Bft (moderate breeze) and was prevailing from the south. Source: KNMI
January 6 » German geophysicist Alfred Wegener first presents his theory of continental drift.
January 6 » New Mexico is admitted to the Union as the 47th U.S. state.
November 7 » The Deutsche Opernhaus (now Deutsche Oper Berlin) opens in the Berlin neighborhood of Charlottenburg, with a production of Beethoven's Fidelio.
November 19 » First Balkan War: The Serbian Army captures Bitola, ending the five-century-long Ottoman rule of Macedonia.
December 6 » The Nefertiti Bust is discovered.
Day of death December 11, 1971
The temperature on December 11, 1971 was between 7.6 °C and 9.4 °C and averaged 8.6 °C. The heavily clouded was. The average windspeed was 3 Bft (moderate breeze) and was prevailing from the west. Source: KNMI
January 22 » The Singapore Declaration, one of the two most important documents to the uncodified constitution of the Commonwealth of Nations, is issued.
February 9 » The 6.5–6.7 Mw Sylmar earthquake hits the Greater Los Angeles Area with a maximum Mercalli intensity of XI (Extreme), killing 64 and injuring 2,000.
March 1 » President of Pakistan Yahya Khan indefinitely postpones the pending national assembly session, precipitating massive civil disobedience in East Pakistan.
July 5 » The Twenty-sixth Amendment to the United States Constitution, lowering the voting age from 21 to 18 years, is formally certified by President Richard Nixon.
October 27 » The Democratic Republic of the Congo is renamed Zaire.
November 15 » Intel releases the world's first commercial single-chip microprocessor, the 4004.
When copying data from this family tree, please include a reference to the origin: J. van Broekhoven, "Database Van Broekhoven", database, Genealogy Online (https://www.genealogieonline.nl/database-van-broekhoven/I293935.php : accessed March 6, 2026), "Jacoba Wilhelmina Onvlee (1887-1971)".
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