Portal:History of science/Selected anniversaries/April 15

April 15:

 * 1415 - Death of Manuel Chrysoloras, Greek humanist and grammarian


 * 1452 - Birth of Leonardo da Vinci, Italian Renaissance polymath (d. 1519)


 * 1552 - Birth of Pietro Cataldi, Italian mathematician (d. 1626)


 * 1704 - Death of Johann van Waveren Hudde, Dutch mathematician (b. 1628)


 * 1707 - Birth of Leonhard Euler, Swiss mathematician (d. 1783)


 * 1741 - Birth of Charles Willson Peale, American painter, soldier and naturalist (d. 1827)


 * 1755 - Samuel Johnson's A Dictionary of the English Language published in London


 * 1764 - Death of Peder Horrebow, Danish astronomer (b. 1679)


 * 1765 - Death of Mikhail Lomonosov, Russian scientist and writer (b. 1711)


 * 1772 - Birth of Étienne Geoffroy Saint-Hilaire, French naturalist (d. 1844)


 * 1793 - Birth of Friedrich Georg Wilhelm von Struve, German astronomer (d. 1864)


 * 1793  - Death of Ignacije Szentmartony, Croatian Jesuit missionary and geographer (b. 1718)


 * 1809 - Birth of Hermann Grassmann, German mathematician (d. 1877)


 * 1854 - Death of Arthur Aikin, English chemist, mineralogist, and writer (b. 1773)


 * 1874 - Birth of Johannes Stark, German physicist, Nobel laureate (d. 1957)


 * 1896 - Birth of Nikolay Nikolayevich Semyonov, Russian chemist, Nobel laureate (d. 1986)


 * 1923 - Insulin becomes generally available for use by diabetics


 * 1927 - Birth of Robert Mills, American physicist (d. 1999)


 * 1993 - Death of John Tuzo Wilson, Canadian geologist (b. 1908)