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Zu Chongzhi (429–500 CE) was a preeminent scientist of the Southern Dynasties during the Northern and Southern Dynasties period. His courtesy name was Wenyuan, and his ancestral home was Qiu County, Fanyang Commandery (in present-day Laishui, Hebei).
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The Heavenly Stems and Earthly Branches were a system used in ancient China to mark years, months, days, and hours. In Journey to the West, the universe is divided into 12 cyclical periods, each named after the Earthly Branches. Similarly, ancient Chinese divided the day into 12 segments, also named after these branches. For…