- 1469 - Ferdinand II of Aragon married Isabella of Castile. Their marriage led to the unification of Aragon and Castile into a single Crown, Spain.
- 1604 - Kepler's Star: German astronomer Johannes Kepler observed that an exceptionally bright star had suddenly appeared in the constellation Ophiuchus. This "new star" turned out to be the last supernova observed in our own galaxy, the Milky Way.
- 1989 - Loma Prieta earthquake: The largest earthquake to occur on the San Andreas Fault in California since 1906, struck the San Francisco Bay Area at 5.04 pm local time and measured 7.1 on the Richter scale.
- 2003 - The pinnacle was fitted on the roof of Taipei 101, a 106-floor skyscraper in Taipei, allowing it to surpass the Petronas Twin Towers in Kuala Lumpur by 50 metres (165 feet) and become the World's tallest building.
Recent days: October 16 - October 15 - October 14
- 1469 - Ferdinand II of Aragon married Isabella of Castile. Their marriage led to the unification of Aragon and Castile into a single Crown, Spain.
- 1604 - Kepler's Star: German astronomer Johannes Kepler observed that an exceptionally bright star had suddenly appeared in the constellation Ophiuchus. This "new star" turned out to be the last supernova observed in our own galaxy, the Milky Way.
- 1989 - Loma Prieta earthquake: The largest earthquake to occur on the San Andreas Fault in California since 1906, struck the San Francisco Bay Area at 5.04 pm local time and measured 7.1 on the Richter scale.
- 2003 - The pinnacle was fitted on the roof of Taipei 101, a 106-floor skyscraper in Taipei, allowing it to surpass the Petronas Twin Towers in Kuala Lumpur by 50 metres (165 feet) and become the World's tallest building.
Recent days: October 16 - October 15 - October 14