The temperature on January 12, 1861 was about -4.4 °C. The air pressure was 1 kgf/m2 and came mainly from the south-southeast. The airpressure was 77 cm mercury. The atmospheric humidity was 95%. Source: KNMI
From February 23, 1860 till March 14, 1861 the Netherlands had a cabinet Van Hall - Van Heemstra with the prime ministers Mr. F.A. baron Van Hall (conservatief-liberaal) and Mr. S. baron Van Heemstra (liberaal).
From March 14, 1861 till January 31, 1862 the Netherlands had a cabinet Van Zuijlen van Nijevelt - Loudon with the prime ministers Mr. J.P.P. baron Van Zuijlen van Nijevelt (conservatief-liberaal) and Mr. J. Loudon (liberaal).
February 23 » President-elect Abraham Lincoln arrives secretly in Washington, D.C., after the thwarting of an alleged assassination plot in Baltimore, Maryland.
April 29 » American Civil War: Maryland's House of Delegates votes not to secede from the Union.
May 6 » American Civil War: Arkansas secedes from the Union.
May 13 » The Great Comet of 1861 is discovered by John Tebbutt of Windsor, New South Wales, Australia.
November 28 » American Civil War: The Confederate States of America accept a rival state government's pronouncement that declares Missouri to be the 12th state of the Confederacy.
December 26 » American Civil War: The Trent Affair: Confederate diplomatic envoys James Murray Mason and John Slidell are freed by the United States government, thus heading off a possible war between the United States and the United Kingdom.
When copying data from this family tree, please include a reference to the origin: Irene Jolanda van der Meulen, "Family tree Ype Ypes (waaronder van der Meulen)", database, Genealogy Online (https://www.genealogieonline.nl/stamboom-ype-ypes/I6706.php : accessed February 8, 2026), "Sjoerd Koopmans (1861-????)".
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