Beginning power
The era of the first century BC was used in 104 BC 84 years. It is also called tranquility. In the Han Dynasty, I used the same power as I used in Bondi Qin Dynasty. This regime was originally made up of equinoxes, and later repaired by Yuuun in the first century BC. The three - generation power of Yuun founded the law of the last year, that is, when the five stars of January came to the standard position as a fundamental starting point of the inverse. In addition, we made forecasts of Japanese eclipses with a 135-month cycle of Japanese eclipses, took the five-star movement for the first time, used precise meeting cycles, and created the Great Principle of Choyun It is highly praised in the history of this law. The solar year of trilateral power is 365 × 385/1539 days, and the lunation month is 29 × 43/81 days.