ON THE REFERENCE PERIOD OF IL-CHIN OF SEASONAL PARTS AND EACH DATE OF THE YEAR IN OLD CHINESE CALENDAR
절기(節氣)와 역일(曆日)에 대한 일진(日辰)의 복귀주기(復歸週期)
Il-Cohin of the 24 subseasons is found to be repeated in the period ut 103, solar yeors. And that of the date in the old Chinese calendar xear is, repeating in the period of 102 solar years. It is also found that the length of lunar month is repeating in nearly 64solar years.