1. 
   Zu Chongzhi
   Chinese astronomer, mathematician, and engineer who created the Daming calendar and found several close approximations for .
   Found op http://www.britannica.com/eb/a-z/z/11
   
   
2. 
   Zu Chongzhi
   Zu Chongzhi ({zh|t=祖沖之|s=祖冲之|p=Zǔ Chōngzhī|w=Tsu Ch`ung-chih}) (429–500), courtesy name Wenyuan (文遠), was a prominent Chinese mathematician and astronomer during the Liu Song and Southern Qi Dynasties. ==Life and works== Chongzhi`s ancestry was from modern Baoding, Hebei. To fl...
   Found op http://en.wikipedia.org/wiki/Zu_Chongzhi
   
   

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