1454: Birth of Amerigo Vespucci, Italian explorer and cartographer (died 1512).

1989: X15 solar flare observed, an indication of a strong solar storm that was at the root of the geomagnetic storm a few days later, which caused a 9-hour power outage in Hydro-Québec's electricity transmission system.

2006: Liquid water is discovered on Enceladus, Saturn's sixth largest moon.