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3rd century BC


 

Inventions, discoveries, introductions

  • Eratosthenes accurately calculates diameter of the Earth
  • Weiqi well-established in China, and may date back to the 2nd millennium BC
  • Stone of Canopus (for Ptolemy III), No. 1, in Rosetta Stone Series of 3 stones. Implements Leap year in Egypt. Leap year not formally recognized until Caesar in 55 B.C.
◄ 3rd century BC: Significant persons
3rd century BC: Decades and years ►

~ Table of Content ~

►Introduction
►Events
►Significant persons
►Inventions, discoveries, introductions
►Decades and years

 

 

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