Both the heavenly stems and the earthly branches are yin, which is called the four pillars of pure yin. The stem and branch calendar (year, month, day and hour) of the time of birth is what we usually call the four pillars, also known as the eight characters.
10 Heavenly Stems: A, B, C, D, Wu, Ji, Geng, Xin, Ren, Gui
(Among them: A, B, Wu, Geng, Ren are yang, B, Ding, Ji, Xin and Gui are yin)
(Among them: Zi, Yin, Chen, Wu, Shen, Xu, are Yang, Chou, Mao, Si, Wei, You, Hai are Yin);
Since yin and yang are in harmony and same-sex repels, people with pure yang or pure yin in the four pillars tend to go to extremes. A pure yin woman in the horoscope means that the year, month, and day are all yin.
Year Pillar, Month Pillar, Sun Pillar, Hour Pillar, a total of four pillars and eight characters are composed of heavenly stems and earthly branches. They are the eight characters calculated based on the year, month, day and time of a person's birth.
There are different opinions on the Bazi pure yang and pure yin, but it is used in this article, so I will explain it briefly here.
I think it is pure nonsense. You can control your own destiny, just have an optimistic attitude and be positive.