About the day » Saturday April 21, 1860Calender converter

• Aleida Northolt, Enschede, Overijssel, Nederland († 1946)
• Antonia Vink OR Vinck, Rotterdam († 1951)
• Anne Christine WEIGEL, Grentzingen (68960, Haut-Rhin, France)
• Annabella FETTES, Cabrach, Banffshire, Scotland († 1868)
• Abraham Goudsmit, Rotterdam, NL († 1943)
• Arend Brugman, Zoelmond († 1881)
• (Stillbirth) MEIJER, Rottum, Kantens
• Albert van Dijk, Steenwijkerwold († 1935)
• Adriana Donders, Tilburg († 1892)
• Arend BRUGMAN (geb Ousen), Rijswijk (gem. Maurik) († 1881)

• Anna Elisabeth Cornelia Gunning (3), Utrecht, Utrecth, Nederland
• Angelus VERNIERS (82), Oostakker
• Adrianus Spruijt (51), Oostvoorne
• Adrianus Spruit, Oostvoorne, Zuid Holland, Nederland
• Andreas Leenders (85), Venlo
• Anna OOSTVEEN (0), Utrecht
• Aldert Jans Huizinga (7), Appingedam
• Adriaan de Been, Oosterhout, Noord-Brabant, Nederland
• Alida Geertsdr. Smeltekop (37), Groningen
• Ammo Stevens van delden (71), Sappemeer

• 1837 » Fredrik Bajer, Danish lieutenant and politician, Nobel Prize laureate († 1922)
• 1838 » John Muir, Scottish-American environmentalist and author († 1914)
• 1851 » Charles Barrois, French geologist and palaeontologist († 1939)
• 1854 » William Stang, German-American bishop († 1907)
• 1864 » Max Weber, German economist and sociologist († 1920)
• 1868 » Alfred Henry Maurer, American painter († 1932)
• 1870 » Edwin Stanton Porter, American director, producer, and screenwriter († 1941)
• 1874 » Vincent Scotto, French actor and composer († 1952)
• 1882 » Percy Williams Bridgman, American physicist and academic, Nobel Prize laureate († 1961)
• 1885 » Tatu Kolehmainen, Finnish runner († 1967)

• 1815 » Joseph Winston, American soldier and politician (b. 1746)
• 1825 » Johann Friedrich Pfaff, German mathematician and academic (b. 1765)
• 1852 » Ivan Nabokov, Russian general (b. 1787)
• 1863 » Sir Robert Bateson, 1st Baronet, Irish politician (b. 1782)
• 1900 » Vikramatji Khimojiraj, Indian ruler (b. 1819)
• 1910 » Mark Twain, American novelist, humorist, and critic (b. 1835)
• 1918 » Manfred von Richthofen, German captain and pilot (b. 1892)
• 1924 » Eleonora Duse, Italian actress (b. 1858)
• 1930 » Robert Bridges, English poet and author (b. 1844)
• 1932 » Friedrich Gustav Piffl, Bohemian cardinal (b. 1864)

• Koning Willem III (Huis van Oranje-Nassau) was from 1849 till 1890 sovereign of the Netherlands (also known as Koninkrijk der Nederlanden)
• From March 18, 1858 till February 23, 1860 the Netherlands had a cabinet Rochussen - Van Bosse with the prime ministers J.J. Rochussen (conservatief-liberaal) and Mr. P.P. van Bosse (liberaal).
• 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).
• The Netherlands had about 3.3 million citizens.
• March 5 » Parma, Tuscany, Modena and Romagna vote in referendums to join the Kingdom of Sardinia.
• March 24 » Sakuradamon Incident: Assassination of Japanese Chief Minister (Tairō) Ii Naosuke.
• April 6 » The Reorganized Church of Jesus Christ of Latter Day Saints, later renamed Community of Christ, is organized by Joseph Smith III and others at Amboy, Illinois.
• April 9 » On his phonautograph machine, Édouard-Léon Scott de Martinville makes the oldest known recording of an audible human voice.
• September 8 » The steamship PSLady Elgin sinks on Lake Michigan, with the loss of around 300 lives.
• October 18 » The Second Opium War finally ends at the Convention of Peking with the ratification of the Treaty of Tientsin, an unequal treaty.

The temperature on April 21, 1860 was about 5.0 °C. There was 2 mm of rain. The air pressure was 2 kgf/m² and came mainly from the southwest. The airpressure was 75 cm mercury. The atmospheric humidity was 84%.