About the day » Thursday December 20, 1866Calender converter

• Appel, de Rijp, Noord-Holland, Nederland
• Aaltje Hondebrink
• Alvina Amanda Charlotte Timm, Bloomfield, Waushara, Wisconsin († 1961)
• Adrianus Hendrikus de Jongh, Breda († 1941)
• Adriaan van de Velde, Overzande
• Adrianus J.W. de Groot, 's-Gravenhage († 1922)
• Andries Postma, Anjum, gem. Oostdongeradeel, Friesland, Nederland († 1953)
• Anna van den Bos, Rotterdam († 1932)
• Adrianus van der Ben, Noord-Waddinxveen († 1871)
• Adelaide Jane Snider, York, Ontario, Canada († 1895)

• Aaltje Westerhuis (30), Ruinerwolt, Drenthe, Netherlands
• Antje Hendriks Koenes (76), Nuis, gem. Marum, Groningen, Nederland
• Allegonda Gennesen (21), Waspik, Noord-Brabant, Nederland
• Arie Hendriksz Schoonhoven (31), Koedijk, Noord-Holland, Netherlands
• Aaltje Jacobs de Haan (2), Lemmer
• Antje van Ek (56), Uffelte (Havelte)
• Adamus Pagen (0), Schinveld
• Andreas Stephanus Linssen (36), Zutphen, Gelderland, Nederland
• Arie van Wijngaarden (1), Sliedrecht
• ? ?

• 1861 » Ferdinand Bonn, German actor († 1933)
• 1861 » Ivana Kobilca, Slovenian painter († 1926)
• 1865 » Elsie de Wolfe, American actress and interior decorator († 1950)
• 1868 » Harvey Samuel Firestone, American businessman, founded the Firestone Tire and Rubber Company († 1938)
• 1869 » Charley Grapewin, American actor († 1956)
• 1871 » Henry Kimball Hadley, American composer and conductor († 1937)
• 1873 » Kan'ichi Asakawa, Japanese historian, author, and academic († 1948)
• 1873 » Mehmet Akif Ersoy, Turkish poet, academic, and politician († 1936)
• 1881 » Branch Rickey, American baseball player and manager († 1965)
• 1886 » Hazel Hotchkiss Wightman, American tennis player and businessman († 1974)

• 1812 » Sacagawea, American explorer (b. 1788)
• 1820 » John Bell, American farmer (b. 1750)
• 1856 » Francesco Bentivegna, Italian activist (b. 1820)
• 1862 » Robert Knox, Scottish surgeon and zoologist (b. 1791)
• 1880 » Gaspar Tochman, Polish-American colonel and lawyer (b. 1797)
• 1893 » George C. Magoun, American businessman (b. 1840)
• 1915 » Upendrakishore Ray, Indian painter and composer (b. 1863)
• 1916 » Arthur Morgan, Australian politician, 16th Premier of Queensland (b. 1856)
• 1917 » Lucien Petit-Breton, French-Argentinian cyclist (b. 1882)
• 1919 » Philip Fysh, English-Australian politician, 12th Premier of Tasmania (b. 1835)

• Koning Willem III (Huis van Oranje-Nassau) was from 1849 till 1890 sovereign of the Netherlands (also known as Koninkrijk der Nederlanden)
• In The Netherlands , there was from February 1, 1862 to February 10, 1866 the cabinet Thorbecke II, with Mr. J.R. Thorbecke (liberaal) as prime minister.
• In The Netherlands , there was from February 10, 1866 to June 1, 1866 the cabinet Fransen van de Putte, with I.D. Fransen van de Putte (liberaal) as prime minister.
• 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).
• The Netherlands had about 3.6 million citizens.
• April 4 » Alexander II of Russia narrowly escapes an assassination attempt by Dmitry Karakozov in the city of Saint Petersburg.
• April 6 » The Grand Army of the Republic, an American patriotic organization composed of Union veterans of the American Civil War, is founded. It lasts until 1956.
• June 3 » The Fenians are driven out of Fort Erie, Ontario back into the United States.
• June 7 » One thousand eight hundred Fenian raiders are repelled back to the United States after looting and plundering the Saint-Armand and Frelighsburg areas of Canada East.
• July 25 » The United States Congress passes legislation authorizing the rank of General of the Army. Lieutenant General Ulysses S. Grant becomes the first to be promoted to this rank.
• October 19 » In accordance with the Treaty of Vienna, Austria cedes Veneto and Mantua to France, which immediately awards them to Italy in exchange for the earlier Italian acquiescence to the French annexation of Savoy and Nice.

The temperature on December 20, 1866 was about 5.9 °C. The air pressure was 1 kgf/m² and came mainly from the west. The airpressure was 77 cm mercury. The atmospheric humidity was 81%.