Interpretation of the formula: Y= two digits after the number of years, D=0.2422, L= leap year, 2 1 century C=7.5, and 20th century =8.35.

For example, the date of beginning of autumn in 2088 = [88× 0.2422+7.5]-[88/4] = 28-22 = 6, and August 6th is beginning of autumn.

2. beginning of autumn is the 13 of the 24 solar terms and the first solar term in autumn. On August 7th or 8th every year, beginning of autumn is considered as the time when the sun reaches 135. Beginning of autumn's "stand" means the beginning, and "autumn" refers to the maturity of crops. Beginning of autumn said that summer is cool and autumn begins, which is a solar term reflecting the season. The ancients in China divided beginning of autumn into three periods: first, waiting for the cool breeze; Second, wait for the white deer to be born; Three are waiting for cicadas to sing.

3. Before and after beginning of autumn, the temperature was still high in most parts of China, and all kinds of crops grew vigorously. Mid-season rice blooms and bears fruit, stems round overnight, soybean pods, corn sprouts and spins, cotton bolls and sweet potato pieces expand rapidly, all of which require emergency water. The drought in this period will cause irreparable damage to the final harvest of crops.

Beginning of autumn is an important New Year's Day holiday in China. As early as 3,000 years ago, the ancients had a ceremony of "beginning of autumn in the western suburbs welcomes autumn", with many customs. Today, people in China still have beginning of autumn's custom of "sticking autumn fertilizer" and "biting autumn".