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General

Population: Between 190 and 230 million*

• Astronomy: Halley's comet first seen (239 BC)
• Chronology: Leap year introduced into Egyptian calendar (239 BC)
• Technology: Oil lamps introduced in Greece (230 BC)
• Deaths: Chinese philosopher Sun-tsi (233 BC)
  King Ashoka of India (232 BC), Greek philosopher and astronomer Aristarchus of Stamos (230 BC)

Africa

• Egypt: Temple of the sun god Horus at Edfu (230 BC)

Asia

• China: Death of Sun-tsi and end of Chinese classical philosophy (233 BC)
  King Zheng of Qin unifies China (230 BC)
• India: Death of King Ashoka (Asoka) ending Mauryan Dynasty (236 or 232 BC)

Europe

• General: War between Sparta and Achaean League (236 BC)
• Greece: End of Antigonus II Gonatus (230 BC)
• Roman Empire: Sardinia and Corsica become part of Roman republic (238 BC)
• Spanish States: Carthaginian expansion occurs (238-237 BC)