How did ancient people know 365 days a year?

How did ancient people know 365 days a year?

China's calendar originated very early. It is said that the Yellow Emperor first created the calendar. The early calendar now only leaves a few words of legend, which is difficult to study deeply. The earliest written calendar appeared in the late spring and Autumn period. It was the most advanced calendar in the world at that time. Its age was 365.25 days, which was the most precise value used in the world at that time. The quartile calendar stipulated that there were 7 Intercalations in 19 years, It was 160 years earlier than the Greek invention of this method to adjust the lunar and solar calendars precisely
In the first year of Taichu (104 BC), Emperor Wu of Han Dynasty carried out Taichu calendar. It was created by Luo xiahong, a folk astronomer in the Western Han Dynasty. It is the first complete handed down calendar since the scientific calendar. It stipulated that the first month should be the first year of the year, and introduced the 24 solar terms created by China for the first time, It is the first time to calculate the occurrence period of solar and lunar eclipses
Zu Chongzhi, an outstanding astronomer and mathematician in the northern and Southern Dynasties, compiled the Daming calendar. It quoted precession for the first time. Although the numerical accuracy was not high, it was a major reform in the history of Chinese calendar. In the Daming calendar, Zu Chongzhi also adopted a new leap cycle of 144 leap months in 391, It is more precise than the 19-year 7-leap of the ancient calendar. He calculated that the number of days in the regression year is 365.24281 days (the current measured value is 365.24220 days), and the number of days in the intersection month is 27.21223 days (the current measured value is 27.21222 days), which are very close to the current measured value

300 divided by 25 = 60 divided by () = () divided by 75

300 divided by 25 = 60 divided by 5 = 900 divided by 75

How much is 24000 divided by 96

250

What is 186 divided by 2?

93