How to explain Historical Records in October Geng Yin?

In ancient times, heavenly stems and earthly branches method was used to record years, with a period of 60 years. At the same time, there are Geng Yin Yue and Geng Yin Day. Here, October Geng Yin refers to October Geng Yin Day. Because the traditional record of the day is also a record of heavenly stems and earthly branches, and it is also a cycle of Jia Zi B Ugliness ... for 60 days, so there is also a Geng Yin Day. Because 365 days in a year cannot be divisible by 60, this method is relatively independent of the lunar calendar and solar calendar. If you want to check, you need to look at the yellow calendar or the perpetual calendar. It is occasionally useful in ancient Chinese.