The next solar term in the Great Heat is Beginning of Autumn. Beginning of Autumn is the 13th solar term among the twenty-four solar terms, and it is also the first solar term of autumn, marking the official beginning of the Mengqiu season. "Autumn" means The heat is gone and the coolness is coming.

According to the position of the sun on the ecliptic, the whole year is divided into twenty-four periods, namely: Beginning of Spring, Rain, Waking of Insects, Vernal Equinox, Tomb Sweeping Day, Grain Rain; Beginning of Summer, Xiaoman, Ear Grain, Summer Solstice, Xiaoshu, Great heat; the beginning of autumn, the end of heat, white dew, autumnal equinox, cold dew, and frost; the beginning of winter, light snow, heavy snow, winter solstice, minor cold, and severe cold.

Together, they are called the twenty-four solar terms. The twenty-four solar terms indicate climate changes and agricultural seasons. China has used them to guide agricultural production in the 2nd century BC.

Extended information:

The "twenty-four solar terms" reflect the annual apparent motion of the sun, so the dates of the "twenty-four solar terms" in the Gregorian calendar are relatively fixed, and they are not consistent. 1-2 days difference. The earth orbits the sun once every 365 days, 6 hours, 9 minutes and 10 seconds (accurately), and it also rotates once every 24 hours.

Because the orbital plane of the Earth's rotation is not consistent with the equatorial plane, but maintains a certain inclination, the position of the direct sunlight hitting the Earth is different throughout the year.

In the northern hemisphere, when the sun shines directly on the Tropic of Cancer, it is called the summer solstice in astronomy; when the sun shines directly on the Tropic of Cancer, it is called the winter solstice. When the sun shines directly on the equator twice in a year, it is the vernal equinox and the autumnal equinox respectively; when the sun shines directly on the Tropic of Cancer or Tropic of Cancer, it is the summer solstice and winter solstice respectively. The direct point of the sun moves back and forth between the Tropic of Cancer and the Tropic of Cancer.