Portal:History of science/Selected anniversaries/April 1

April 1:

 * 1640 - Birth of Georg Mohr, Danish mathematician (d. 1697)


 * 1776 - Birth of Sophie Germain, French mathematician (d. 1831)


 * 1826 - Samuel Morey patents the internal combustion engine


 * 1865 - Birth of Richard Adolf Zsigmondy, Austrian-born chemist, Nobel Prize laureate (d. 1929)


 * 1933 - Birth of Claude Cohen-Tannoudji, French physicist, Nobel laureate


 * 1947 - Birth of Alain Connes, French mathematician


 * 1968 - Death of Lev Davidovich Landau, Russian physicist, Nobel Prize laureate (b. 1908)


 * 1976 - Jovian-Plutonian gravitational effect is first reported by the astronomer Patrick Moore


 * 1981 - Daylight saving time is introduced in the USSR