A Chinese classic from the Song dynasty compiled by Xu Da Sheng (徐大升), 《渊海子平》was the first of its kind to capture and describe the system of calculating and divining an individual’s life journey through the use of the Four Pillars of Destiny, Heavenly Stems and Earthly Branches, and the Five Elements. Remaining one of the foremost literary references for most practitioners, this text builds upon the pillar calculation system proposed by Li Xu Zhong (李虚中). This text posits an individual’s Day Master as the main factor in a Bazi chart, with the remaining pillars as supporting elements.