What does "broken group" mean in the Gregorian calendar?

Break-up Day: The 6th of each month is the break-up day, namely Jiayin, Gengyin, Renchen, Chen Wu, Gengshen and Jimao. In ancient times, when buying and selling livestock could not be used.

Knowledge Link: heavenly stems and earthly branches is referred to as "dry branch" for short.

Party A, Party B, Party C, Party D, Party E, Party B, Party G, Party A, Party B, Party C and Party B are collectively called Ten Days Dry;

Zi, Ugly, Yin, Mao, Chen, Si, Wu, Wei, Shen, You, Xu and Hai are called the Twelve Earthly Branches.

The composition of heavenly stems and earthly branches formed the ancient chronology. In folklore, people think that the sky is dry and corresponds to some omens. Ten branches and twelve branches are matched in turn to form sixty basic units, forming a set of branches and disciplines. Judging from the Oracle Bone Inscriptions unearthed in Yin Ruins, heavenly stems and earthly branches was mainly used for recording dates, divination and cooperation in China, and later used in the fields of geomantic omen and astrology.

Used in geomantic omen, astrology and numerology: in the theory of Yin-Yang and Five Elements, the branches are divided into Yin and Yang in order, odd numbers belong to Yang, and even numbers belong to Yin. A, C, E, G and N in the heavenly stems, and Zi, Yin, Chen, Wu, Shen and Xu in the earthly branches are yang numbers; The heavenly stems of B, D, Ji, Xin and Gui and the earthly branches of Ugly, Mao, Si, Wei, You and Hai are all negative numbers. On this basis, according to the theory of mutual restriction, the harmony, rise and fall, conflict and its birth and death of personnel are calculated.

Symbols such as heavenly stems and earthly branches are endowed with rich mysterious cultural contents, which are important materials for understanding the thinking habits and lifestyles of ancient people in China.