Portal:History of science/Selected anniversaries/January 2
- 1822 - Birth of Rudolf Clausius, German physicist (d. 1888)
- 1827 - Birth of Peter Semenov of Tian Shan, Russian explorer (d. 1914)
- 1860 - The discovery of the planet Vulcan is announced at a meeting of the Académie des Sciences in Paris
- 1892 - Death of George Airy, British Astronomer Royal (b. 1801)
- 1893 - Death of John Obadiah Westwood, British entomologist (b. 1805)
- 1905 - Birth of Lev Schnirelmann, Russian mathematician (d. 1938)
- 1940 - Birth of S. R. S. Varadhan, Indian-American mathematician
- 1947 - Birth of Jack Hanna, American zoologist
- 2005 - Death of Maclyn McCarty, American geneticist (b. 1911)