by @bardsilver on Brave-Smoke's Corner
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Wen Wang Gua (Chinese: 文王卦; pinyin: Wén Wáng Guà) is a method of interpreting the results of I Ching divination that was first described in writing by Jing Fang in Han dynasty China. It is based on correlating trigrams to the Celestial Stems and Earthly Branches of the Chinese calendar, and then using the stem and branch elements to interpret the lines of the trigrams and hexagrams of the I Ching. The method is popular in South East Asia. It is known by various names: (Liu Yao) (six lines divination) refers to the fact that it interprets the meaning of six symbols; the Najia method, indicates its logic of elemental values derived from the Chinese calendar; Huo Zhu Lin (火珠林), or the Fire Pearl Forest method, refers to a classical textual tradition associated with this form of divination; Wu Xing Yi (changes of the five elements); or Wen Wang Ke (Lessons of King Wen).
Despite being the mainstream method of practical IChing divination in China, Wen Wang Gua and the Na Jia system were largely absent from major English-language translations of the I Ching throughout the twentieth century.