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How did beginning of autumn work it out? What are the characteristics of the climate in early autumn?
How did beginning of autumn work it out?

The calculation formula is [y * d+c]-L.

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: 2088 beginning of autumn Date =[88? 0.2422+7.5]-[88/4]=28-22=6, August 6th is beginning of autumn.

Exception: The calculation result in 2002 is 1 day.

What are the characteristics of the climate in early autumn?

Features 1:

Beginning of autumn means rain, storm, humidity, etc. At the turning point of the year, it tends to decline or decrease.

Feature 2:

Seasonal changes, rainfall, rainstorm, dry and wet changes in southern China are obvious; In the northern region, these changes are not obvious, but the temperature is obvious.

Feature 3:

After entering autumn, in nature, the qi of Yin and Yang began to change, everything began to grow from lush to mature, and the climate began to transition from rainy and humid in summer to dry and rainy in autumn.

Feature 4:

The beginning of autumn doesn't mean the end of hot weather. The so-called hot weather is in dog days. According to the calculation method of dog days, beginning of autumn is often in dog days until the heat, so the weather is still very hot in early autumn, and it will generally cool after the Millennium solar terms. The watershed of summer heat is in autumn, not at the turn of summer and autumn. The climate in autumn is divided into two stages, the early autumn is sultry, and it tends to be dry and cool after the Mid-Autumn Festival. This is a season of alternating hot and cold.

Feature 5:

It's usually still noon in beginning of autumn. The so-called heat can be divided into three stages: the beginning, the middle and the end, and its date is determined by the date of solar terms and the date of the main branch year. According to China's traditional calculation method, the third and fourth Geng days from summer to the future are the first (head) and middle start dates respectively, and the first Geng day after beginning of autumn is the last first day. Because every Geng day is 10 days apart, the stipulated time of the first day and the last day is 10 days. Because the third Geng day (the first autumn) after the summer solstice solar term appears sooner or later, the number of days in autumn is long or short, which may be 10 or 20 days. According to the calculation method of three volts, beginning of autumn is often at noon, which means that just because beginning of autumn enters the solar term does not mean that the temperature will drop.