About the day » Friday July 20, 1866Calender converter

• ALPHONSE JOSEPH GRUSLIN, ERNONHEID
• Aaltje Melissen, Zuidwolde, Drenthe, Nederland († 1911)
• Adriana van der Heiden, Klaaswaal, prov Zuid Holland
• Antonius HELMONS, Steenbergen (NL/NB) († 1933)
• Antje Spakman, Stootshorn (gem. Noordbroek) († 1941)
• Aaltje Rienstra, Almenum, Barradeel, Friesland, Netherlands († 1939)
• Albert Kamminga, Duurswoude († 1941)
• Antonij Helmons, Steenbergen, Noord-Brabant, Nederland († 1933)
• Anna Maria Oostewechel, Diepenveen († 1924)
• Aaltje Melissen, Zuidwolde († 1911)

• Anna Grada BRANS (3), Elst, Overbetuwe
• Aafje Haak (1), Medemblik
• Anna Francisca VERHOEF (34), Baasrode,9200,Flandre Orientale,Flandre,BELGIQUE
• (Hendrina) Catrina Katharina de Joode (76), Woudrichem (Br.)
• Anna Tromp, Nieuwendam, Noord-Holland, Nederland
• Aaltje Bos (51), Den Helder
• Anna Buisman, Utrecht
• Agatha Harmens Poelsma (32), Menaldumadeel, Friesland, Nederland
• Aleijda FAASSEN (64), Utrecht
• Aaltjen Koopts (45), Kampen, Overijssel, Nederland

• 1849 » Robert Anderson Van Wyck, American lawyer and politician, 91st Mayor of New York City († 1918)
• 1852 » Theo Heemskerk, Dutch lawyer and politician, Prime Minister of the Netherlands († 1932)
• 1854 » Philomène Belliveau, Canadian artist († 1940)
• 1864 » Erik Axel Karlfeldt, Swedish poet, Nobel Prize laureate († 1931)
• 1864 » Ruggero Oddi, Italian physiologist and anatomist († 1913)
• 1868 » Miron Cristea, Romanian cleric and politician, 38th Prime Minister of Romania († 1939)
• 1873 » Alberto Santos-Dumont, Brazilian pilot († 1932)
• 1876 » Otto Blumenthal, German mathematician and academic († 1944)
• 1877 » Tom Crean, Irish sailor and explorer († 1938)
• 1882 » Olga Hahn-Neurath, Austrian mathematician and philosopher († 1937)

• 1816 » Gavrila Derzhavin, Russian poet and politician (b. 1743)
• 1866 » Bernhard Riemann, German mathematician and academic (b. 1826)
• 1897 » Jean Ingelow, English poet and author (b. 1820)
• 1901 » William Cosmo Monkhouse, English poet and critic (b. 1840)
• 1903 » Leo XIII, pope of the Catholic Church (b. 1810)
• 1908 » Demetrius Vikelas, Greek businessman and author (b. 1835)
• 1908 » Karl Bernhard Zoeppritz, German geophysicist and seismologist (b. 1881)
• 1910 » Anderson Dawson, Australian politician, 14th Premier of Queensland (b. 1863)
• 1922 » Andrey Markov, Russian mathematician and theorist (b. 1856)
• 1923 » Pancho Villa, Mexican general and politician, Governor of Chihuahua (b. 1878)

• 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.
• January 12 » The Royal Aeronautical Society is formed in London.
• February 21 » Lucy Hobbs Taylor becomes the first American woman to graduate from dental school.
• April 10 » The American Society for the Prevention of Cruelty to Animals (ASPCA) is founded in New York City by Henry Bergh.
• May 5 » Memorial Day first celebrated in United States at Waterloo, New York.
• July 24 » Reconstruction: Tennessee becomes the first U.S. state to be readmitted to the Union following the American Civil War.
• July 30 » Armed Confederate veterans in New Orleans riot against a meeting of Radical Republicans, killing 48 people and injuring another 100.

The temperature on July 20, 1866 was about 17.7 °C. There was 2 mm of rain. The air pressure was 14 kgf/m² and came mainly from the west-northwest. The airpressure was 76 cm mercury. The atmospheric humidity was 76%.