About the day » Sunday April 12, 1863Calender converter

• Adrianus Nowee, Wateringen, Westland, Zuid-Holland, Nederland († 1905)
• * Maria Antonia Pelgrim, Klundert († 1944)
• Aaltje Ulenreef, Almelo Ambt, Overijssel, Nederland († 1905)
• Adriaan Jannes Erasmus, Cadzand/Sluis Zeeuws-Vlaandern Zeeland Nederland († 1891)
• Albertus Willebrordus Beugel, Amsterdam
• Alfons Dierickx, Sint-Lievens-Esse, Oost-Vlaanderen, Belgium († 1863)
• Adriana Jansens, Scherpenisse († 1901)
• Adrianus Nowee, Wateringen, Nederland († 1905)
• Aart Everts, Putten († 1923)
• Aaltje Ulenreef, Ambt Almelo († 1905)

• Anne Marie Thérèse Purnode (54), Visé, Luik, België
• Agnes van Nassau, Roosendaal, Noord-Brabant, Nederland
• De Schryver (0), Bornem
• Anna Buhler (47), Sneek, Súdwest-Fryslân, Friesland, Nederland
• Adriaantje Leendertsdr Blijdorp (64)
• Abraham Franklin Baughman (59), Clay City, Clay, Indiana, United States
• Adrianus van Velzen (81), Overschie
• Ann Eliza Brooks (31), Brooksville, Bracken Co.Kentucky
• * Geertruydje (Geertje) van Veen (66), Rotterdam
• Albertus MOS (55), Epe, Nederland, Gelderland, Vaassen

• 1851 » Edward Walter Maunder, English astronomer and author († 1928)
• 1851 » José Gautier Benítez, Puerto Rican soldier and poet († 1880)
• 1852 » Ferdinand von Lindemann, German mathematician and academic († 1939)
• 1856 » Martin Conway, 1st Baron Conway of Allington, English mountaineer, cartographer, and politician († 1937)
• 1863 » Raul Pompeia, Brazilian writer († 1895)
• 1868 » Akiyama Saneyuki, Japanese admiral († 1918)
• 1869 » Henri Désiré Landru, French serial killer († 1922)
• 1871 » Ioannis Metaxas, Greek general and politician, 130th Prime Minister of Greece († 1941)
• 1874 » William B. Bankhead, American lawyer and politician, 47th Speaker of the United States House of Representatives († 1940)
• 1880 » Addie Joss, American baseball player and journalist († 1911)

• 1817 » Charles Messier, French astronomer and academic (b. 1730)
• 1850 » Adoniram Judson, American lexicographer and missionary (b. 1788)
• 1866 » Peter Hesketh-Fleetwood, English politician, founded Fleetwood (b. 1801)
• 1872 » Nikolaos Mantzaros, Greek composer and theorist (b. 1795)
• 1878 » William M. Tweed, American lawyer and politician (b. 1823)
• 1879 » Richard Taylor, American general (b. 1826)
• 1885 » William Crowther, Dutch-Australian politician, 14th Premier of Tasmania (b. 1817)
• 1898 » Elzéar-Alexandre Taschereau, Canadian cardinal (b. 1820)
• 1902 » Marie Alfred Cornu, French physicist and academic (b. 1842)
• 1906 » Mahesh Chandra Nyayratna Bhattacharyya, Indian scholar, academic, and philanthropist (b. 1836)

• 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.
• The Netherlands had about 3.6 million citizens.
• January 26 » American Civil War: Governor of Massachusetts John Albion Andrew receives permission from the Secretary of War to raise a militia organization for men of African descent.
• February 7 » HMSOrpheus sinks off the coast of Auckland, New Zealand, killing 189.
• May 18 » American Civil War: The Siege of Vicksburg begins.
• July 19 » American Civil War: Morgan's Raid: At Buffington Island in Ohio, Confederate General John Hunt Morgan's raid into the north is mostly thwarted when a large group of his men are captured while trying to escape across the Ohio River.
• September 6 » American Civil War: Confederate forces evacuate Battery Wagner and Morris Island in South Carolina.
• October 31 » The New Zealand Wars resume as British forces in New Zealand led by General Duncan Cameron begin their Invasion of the Waikato.

The temperature on April 12, 1863 was about 13.0 °C. The air pressure was 2.5 kgf/m² and came mainly from the east. The airpressure was 76 cm mercury. The atmospheric humidity was 40%.