What did Geng Xin mean in ancient times?

In ancient times, Geng Xin refers to the seventh and eighth places of heavenly stems, which are used to record the year, month and day in coordination with earthly branches.

Among the five elements, Geng Xin is the gold of the West.

G: What's more, autumn harvest is waiting for spring.

Xin: Jin weixin, don't have a taste when it's over. If you are innovative, everything will change with awe and the program will be completely new.

Extended data

The cycle of heavenly stems is ten, with ten hours, ten days, ten months and ten years as different cycles, which are repeated in an orderly manner and form a stable periodic law. The cycle of the underground branch is twelve, with twelve hours, twelve days, twelve months and twelve years as different cycles, which are repeated in an orderly manner and form a stable periodic law.

Branches and branches record the time history of the Chinese nation. Before the calendar year entered China, the ancients used dry branches to record the year, which was recorded every month, every day and every hour. Ganzhi Chronology is an undeniable history based on a long historical record.

Among the natural features of the five elements of A, B, C, D, E, Ji, G, Xin, Man and Ghost, A and B carry qi, C carries fire, E carries humidity, dryness and cold, which shows that the qi of the five elements in the sky changes gradually according to the mutual development process of the five elements.

References:

Baidu Encyclopedia-heavenly stems and earthly branches