Was there a solar calendar in ancient China?

Yes, October in the Gregorian calendar.

Yi people's October solar calendar comparable to Mayan civilization: the calendar is a symbol of human civilization. One of the essences of the world-famous Mayan culture is the calendar. In the past, most parts of China used the Lunar New Year. However, among the Yi people in China, there is also a little-known ancient calendar-the October solar calendar of the Yi people. It is speculated that this calendar originated from Fuxi in ancient times, with a history of about tens of thousands of years. It traces the history of China's civilization back to Egypt, India and Babylon.

The October solar calendar of the Yi people is marked by two cycles of the ecliptic 12, with three cycles of the ecliptic as a cycle (month), that is, the 36th is January and 30 cycles of the ecliptic are one year. 1 year, 10, 360 days, 10 ends, plus 5 days of "New Year's Day", commonly known as "October Year", 365 days for the whole year. Add 1 day every three years, that is, leap year (leap day), that is, 366 days.

According to textual research, the tomb of the Yi people looking to heaven is actually an observatory used by the ancients to observe the stars, which is closely related to the Yi solar calendar. The October solar calendar of Yi people is a long and mysterious ancient calendar, which has a deep relationship with China's Confucianism, Taoism and Yin-Yang theory. Today, there are still many "passwords" to be deciphered and studied.