Beginning of autumn time in 2023 is on August 8th, which is during the midsection of the dog days (July 22nd, 2023 ~ August 20th, 2023 10). The dog days are hot in a year, and the hottest stage is midsection. Beginning of autumn only represents the arrival of autumn, not the autumn in the meteorological sense.

The hot weather will only fade after the summer vacation. The summer vacation in 2023 will be on August 23rd, which means it will be at least half a month after beginning of autumn. According to the traditional three-volt calculation, the solar terms in beginning of autumn are in the three-volt period, so the weather is still very hot after the solar terms in beginning of autumn. Generally, the summer heat will not come out until after the summer heat.

Early beginning of autumn and Late beginning of autumn:

The early beginning of autumn and late beginning of autumn are calculated according to the variation offset of the solar meridian around beginning of autumn. The solar ecliptic refers to the position of the sun in the east longitude on the ecliptic, with vernal equinox as the benchmark. Every year, beginning of autumn marks that the longitude of the sun is 135 degrees. At this time, the sun moves from south to north. As a result, after beginning of autumn, the angle of sunlight begins to decrease and the temperature gradually drops. In calendar, marking beginning of autumn as a solar term can explain the change of the sun's running position more accurately and provide reference for agricultural production.

Early beginning of autumn means that the time node in beginning of autumn falls before August 7th, while late beginning of autumn falls on or after August 8th. Secondly, take the specific time as a reference. Early beginning of autumn refers to a period of time from 0: 00 to 12: 00, and late beginning of autumn refers to12: 24.