561 BCE
All eight solar system planets, including the now redefined dwarf planet Pluto, fall into planetary alignment. Croesus becomes king of Lydia (or 560 BC).
Geopolitics & Diplomacy
- Croesus becomes king of Lydia (or 560 BC).source
Science & Discovery
- All eight solar system planets, including the now redefined dwarf planet Pluto, fall into planetary alignment.source
Deaths
- Alyattes, king of Lydia (or 560 BC)source