The time for the Beginning of Autumn in 2020 is: Friday, August 7, 2020 at 9:06:03

The Beginning of Autumn is the 13th of the twenty-four solar terms, and the handle of the Big Dipper points to the southwest , the sun reaches 135° of ecliptic longitude, which is celebrated every year from August 7 to 9 in the Gregorian calendar. Beginning of Autumn is the first solar term of autumn and the starting point of autumn. Autumn starts from the beginning of autumn and ends at the beginning of winter. Its beginning and end are the results of the movement of celestial bodies.

From the perspective of solar terms:

Autumn has indeed entered after the Beginning of Autumn, and the arrival of Beginning of Autumn marks the beginning of autumn.

But because the beginning of autumn is still in the dog days of summer, it is not considered autumn.

From the perspective of temperature:

After the Beginning of Autumn, in order to distinguish the heat of autumn from summer, meteorologists have now added another autumn condition: "After the Beginning of Autumn, the temperature rises for five consecutive years." When the average daily temperature stabilizes below 22 degrees, it is considered the beginning of autumn, and autumn ends when it falls below 10 degrees.

So, after the Beginning of Autumn, it is not actually autumn.