Portal:History of science/Selected anniversaries/April 30
- 1006 - Supernova SN 1006, the brightest supernova in recorded history, appears in the constellation Lupus
- 1483 - Orbital calculations suggest that on this day, Pluto moved inside Neptune's orbit until July 23, 1503.
- 1492 - Spain gives Christopher Columbus his commission of exploration
- 1696 - Robert Plot, British naturalist (b. 1640)
- 1723 - Birth of Mathurin Jacques Brisson, French naturalist (d. 1806)
- 1777 - Birth of Carl Friedrich Gauss, German mathematician (d. 1855)
- 1829 - Birth of Ferdinand von Hochstetter, Austrian geologist (d. 1884)
- 1875 - Jean-Frédéric Waldeck, French explorer, lithographer, and cartographer (b. 1766)
- 1876 - Birth of Orso Mario Corbino, Italian physicist (d. 1937)
- 1916 - Birth of Claude Shannon, American engineer and mathematician (d. 2001)