Zu Chongzhi was a Chinese astronomer, mathematician, politician, inventor, and writer during the Liu Song and Southern Qi dynasties. He was most notable for calculating pi as between 3.1415926 and 3.1415927, a record in accuracy which would not be surpassed for over 800 years.
On 20 April 2009, Google celebrated Zu Chongzhi’s Birthday with a doodle
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