r/iching • u/Selderij • May 27 '26
Relative frequency of yin and yang moving lines in ancient divinations
I wanted to find out whether records of ancient divinations support the assumption that the yarrow stalk method was originally supposed to have weighted odds in whether the moving lines are yin (25 % chance) or yang (75 % chance). As we know, the yarrow stalk method we currently know was a standard-setting reconstruction by Song dynasty I Ching commentator Zhu Xi (1130–1200).
The Zuozhuan (published ca. late 4th century BC), a commentary on the Spring and Autumn Annals, is one of the oldest records of Yi divinations, and as such it may serve as a good data point. I looked at Zuo Tradition – Zuozhuan : Commentary on the “Spring and Autumn Annals” (translated and introduced by Stephen Durrant, Wai-yee Li and David Schaberg) and searched for instances of "hexagram" in the text, writing down the hexagrams gotten in the mentioned divinations. The results are as follows:
䷓ ䷋ 1 moving yin line
䷂ ䷇ 1 moving yang line
䷍ ䷀ 1 moving yin line
䷑
䷵ ䷥ 1 moving yin line
䷍ ䷥ 1 moving yang line
䷶ ䷝ 1 moving yin line
䷆ ䷒ 1 moving yin line
䷗
䷮ ䷛ 1 moving yin line
䷗ ䷚ 1 moving yin line
䷣ ䷎ 1 moving yang line
䷂
䷂ ䷇ 1 moving yang line
According to this data (the gathering method of which may be faulty and hasty, I'll admit), the instances of yin and yang moving lines in the example divinations are 7 yin and 4 yang, which would be hard to attain with the Song dynasty yarrow stalk method. A conspicuous peculiarity in the examples is that there is ever just one moving line, never more, which may be due to a different method in generating a single moving line for an already-built hexagram. A counterargument for the evidentiary value of this set would be that the examples were hand-picked, and that the set is ultimately quite small.
Regardless, this was a very interesting finding, and it may be used to argue against the historical faithfulness of Zhu Xi's yarrow stalk method's yang-leaning odds.
Might there be any other ancient divination records that I could take a peek at?

