The temperature on May 20, 1787 was about 11.0 °C. Wind direction mainly east. Weather type: helder. Special wheather fenomena: noorderlicht. Source: KNMI
January 11 » William Herschel discovers Titania and Oberon, two moons of Uranus.
May 25 » After a delay of 11 days, the United States Constitutional Convention formally convenes in Philadelphia after a quorum of seven states is secured.
August 6 » Sixty proof sheets of the Constitution of the United States are delivered to the Constitutional Convention in Philadelphia, Pennsylvania.
September 17 » The United States Constitution is signed in Philadelphia.
October 1 » Russians under Alexander Suvorov defeat the Turks at Kinburn.
October 29 » Mozart's opera Don Giovanni receives its first performance in Prague.
Day of death September 18, 1868
The temperature on September 18, 1868 was about 19.8 °C. There was 0.2 mm of rain. The air pressure was 1 kgf/m2 and came mainly from the south-southeast. The airpressure was 75 cm mercury. The atmospheric humidity was 73%. Source: KNMI
From June 1, 1866 till June 4, 1868 the Netherlands had a cabinet Van Zuijlen van Nijevelt - Heemskerk with the prime ministers Mr. J.P.J.A. graaf Van Zuijlen van Nijevelt (AR) and Mr. J. Heemskerk Azn. (conservatief).
From June 4, 1868 till January 4, 1871 the Netherlands had a cabinet Van Bosse - Fock with the prime ministers Mr. P.P. van Bosse (liberaal) and Mr. C. Fock (liberaal).
January 27 » Boshin War: The Battle of Toba–Fushimi begins, between forces of the Tokugawa shogunate and pro-Imperial factions; it will end in defeat for the shogunate, and is a pivotal point in the Meiji Restoration.
March 8 » Sakai incident: Japanese samurai kill 11 French sailors in the port of Sakai, Osaka.
May 14 » Boshin War: The Battle of Utsunomiya Castle ends as former Tokugawa shogunate forces withdraw northward.
July 25 » The Wyoming Territory is established.
August 18 » French astronomer Pierre Janssen discovers helium.
December 10 » The first traffic lights are installed, outside the Palace of Westminster in London. Resembling railway signals, they use semaphore arms and are illuminated at night by red and green gas lamps.
When copying data from this family tree, please include a reference to the origin: Wesley Brown, "The Brown Tree", database, Genealogy Online (https://www.genealogieonline.nl/the-brown-tree/P3204.php : accessed February 2, 2026), "Helena SPIEGELHALTER (1787-1868)".
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