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

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

Beginning of autumn, the thirteenth of the 24 solar terms, is the end of the lunar calendar and the beginning of its application. The time is around the first day of the seventh lunar month (between August 7th and 9th in Gregorian calendar). "Autumn" means that summer heat turns cold, which means the beginning of autumn. When we arrived in early autumn, the plane tree began to shed its leaves, so there is an idiom "Autumn knows when to shed its leaves".

Literally, the word "autumn" consists of two words: "Wo" and "Huo", which means that the grain is ripe. Autumn is the transitional season when the weather turns from hot to cold, and then from cold to cold. Beginning of autumn is the first solar term in autumn.

As the saying goes, "one summer is full of deficiency." When beginning of autumn comes, although the weather is cool in the morning and evening, autumn tigers are still raging, and the elderly are prone to fatigue, weakness and dullness. According to the principle of "nourishing yang in spring and summer and nourishing yin in autumn and winter" in traditional Chinese medicine, it is necessary to make up at this time. But beginning of autumn is not suitable for special tonic, and beginning of autumn is suitable for eating some dampness-removing food before and after.