How many quarters were there in a year in ancient times?

Reference: A year in the Spring and Autumn Period and the Warring States Period has been divided into four seasons: spring, summer, autumn and winter. It can be clearly seen from the original text of Chunqiu, such as "thirty-two years of Zhuanggong, winter, Defarge."

But in earlier ancient times, our ancestors once divided a year into spring and autumn. Because the ancients at that time did not pay attention to the subjective feelings of hot and cold. But spring represents sowing and autumn represents harvest. For our ancient farming civilization, both are crucial. Therefore, although the climate change at that time was not much different from that at present, there were two seasons in a year, with May beginning in autumn and 165438+ 10 beginning in spring.