This day in 1846, astronomer Johann Gottfried Galle became the first person ever to observe the planet Neptune, the existence of which had been mathematically predicted by Urbain-Jean-Joseph Le Verrier and John Couch Adams.
| 1939: | | | Sigmund Freud, the founder of modern psychoanalysis, died in London. |
|
| 1868: | | A small group of Puerto Rican radicals committed to independence attempted an uprising, El Grito de Lares; the revolt was crushed by the Spanish. |
|
| 1862: | | | Otto von Bismarck was appointed prime minister of Prussia by William I. |
|
| 1806: | | Lewis and Clark arrived in St. Louis, Missouri, at the end of their daring expedition to the Pacific Northwest. |
|
| 1779: | | | During the American Revolution, in the midst of a naval engagement between the warships Bonhomme Richard and Serapis off the east coast of England, American commander John Paul Jones answered a call to surrender from his English counterpart with the famous quotation, “I have not yet begun to fight!” |
|