Portal:History of science/Selected anniversaries/May 30
- 1423 - Birth of Georg Purbach, German mathematician and astronomer (d. 1461)
- 1814 - Birth of Eugène Charles Catalan, Belgian mathematician (d. 1894)
- 1901 - Death of Victor D'Hondt, Belgian mathematician (b. 1841)
- 1908 - Birth of Hannes Alfvén, Swedish physicist and Nobel Prize laureate (d. 1995)
- 1912 - Birth of Julius Axelrod, American biochemist and Nobel Prize laureate (d. 2004)
- 1912 - Birth of Erich Bagge, German physicist
- 1926 - Death of Vladimir Steklov, Russian physicist (b. 1864)
- 1964 - Death of Leó Szilárd, Hungarian-American physicist (b. 1898)
- 1971 - Mariner 9 is launched toward Mars.