How is the beginning of autumn calculated? What are the characteristics of the climate in Beginning of Autumn?

How is the beginning of autumn calculated?

The calculation formula is: [Y*D C]-L

Formula interpretation: Y=last 2 digits of the year, D=0.2422, L=leap year, C=7.5 in the 21st century, 20th century = 8.35.

For example: the date of the Beginning of Autumn in 2088 = [88?0.2422 7.5]-[88/4]=28-22=6, August 6 is the Beginning of Autumn.

Exception: Add 1 day to the calculation result in 2002.

What are the characteristics of the climate in Beginning of Autumn?

Feature 1:

The beginning of autumn means that rainfall, storms, humidity, etc. are at a turning point in the year and tend to decline or decrease.

Feature 2:

During the seasonal change, rainfall, storms, dryness and humidity in the southern region change significantly; in the northern region, these changes are not obvious, and the most obvious change is the temperature.

Feature 3:

After entering autumn, the yin and yang in nature begin to change, everything begins to grow from lush growth to bleak maturity, and the climate begins to change from the rainy, humid and hot summer to the autumn The drier and drier climate transition.

Feature 4:

The beginning of autumn does not mean the end of the hot weather. The so-called heat is in the three volts. According to the calculation method of the three volts, the period from the beginning of autumn to the end of summer is often still in the period of three volts, so the weather in early autumn is It's still very hot, and it usually doesn't really cool until after the Bailu solar term. The dividing line between hot and cold 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 hot, and the mid-autumn period tends to be dry and cool. This is a season of alternating hot and cold weather.

Feature 5:

The Beginning of Autumn is often still in the middle period. The so-called heat in the three volts can be divided into the first volt, the middle volt and the last volt. Its date is determined by the dates of the solar terms and the dates of the stems and branches. my country's traditional calculation method stipulates that the third and fourth Geng days after the summer solstice are the starting dates of the first and middle days respectively, and the first Gen day after the beginning of autumn is the first day of the last day. . Because there are 10 days between each Geng day, the prescribed time for the first and last days is 10 days. And because the third Geng day after the summer solstice (the first day of the fall) appears sooner or later each year, the number of days of the middle fall varies, and it may be 10 days or 20 days. According to the calculation method of "three volts", the day of Beginning of Autumn is often still in the middle volts period. In other words, entering the Beginning of Autumn solar term does not mean that the temperature will drop.