In the Chinese lunar calendar, the ten heavenly stems such as A, B, C and D are matched with the twelve earthly branches such as Zichou, Yinmao and so on. For example, 2015 AD is the year of Yiwei in the Chinese lunar calendar, commonly known as the Year of the Sheep. "Sheep" is this year's "Tai Sui".
In the theory of numerology, the twelve zodiac signs are matched with Yiwei (sheep) this year. According to the relationship between the heavenly stems and the earthly branches, the relationship between "generation" and "restraint" is calculated. The one that matches Yiwei (sheep) is called "Xiangsheng" and "Combined"; those that are not compatible with Yiwei (sheep) are called "Chong" and "Off".
This year 2015 is the year of Yiwei (Sheep). People whose zodiac sign is Sheep will be "sitting on Tai Sui's head" this year, which is the "birth year" as the saying goes, and their fortune will be very bad.
For people born in the Year of the Ox, Ox and Sheep are in conflict with each other, so this year they are in conflict with Tai Sui, and their fortune is very bad.
For people who were born in the Year of the Horse, since the Horse and the Sheep are "mutual" and "combined", this year is the "Sui", and their fortune is very good.