What is the calendar for calculating the occurrence period of solar eclipse in Han Dynasty?

The calendar for calculating the solar eclipse cycle in Han Dynasty is called taichu calendar.

It is the first ancient calendar handed down in China with complete data: the first month is the beginning of a year, the original 24 solar terms in China are distributed in 12 months, and the month without neutral atmosphere is regarded as a leap month, thus making the month and season more reasonable; The measurement of the rendezvous period of planets is relatively accurate. For example, Mercury is 1 15.87 days, which is only 0.0 1 day less than the current measured value 1 15.88 days; The mating cycle of 135 months is adopted, that is, the annual eclipse is 346.66 days, which is only 0.04 days different from the current measured value.