145 BCCenturies: 3rd century BC - 2nd century BC - 1st century BC
- In the Battle of the Oenoparus, Ptolemy VI Philometor defeats the Seleucid usurper Alexander Balas, but dies in the battle.
- Ptolemy VII becomes king of Egypt briefly, then is assassinated by Ptolemy VIII.
- Hipparchus determines the length of the tropical year.
- Sima Qian, Chinese historian (or 135)