In the time from the Western Han dynasty (206 BC-25 AD) to the Five Dynasties period (907-960 AD), the 24 Solar Terms, the lunar cycle and the placement of the intercalary months in the lunar calendar became well determined, and this was of tremendous assistance to agriculture in ancient China.
西漢到五代間，二十四節氣、月亮的朔望、年曆中閏月的安排，都已經十分完備，對中國古代農業有很大的貢獻。