Is the autumnal equinox the beginning of autumn

The autumn equinox is the beginning of autumn. The autumnal equinox is the sixteenth of the twenty-four solar terms, and it is also the beginning of real autumn. The time usually falls on September 22nd, 23rd or 24th of the Gregorian calendar every year, and the climate in the south begins to fall from this solar term. After the autumnal equinox, the temperature drops gradually.

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On the day of the autumnal equinox, the sun shines almost directly on the equator of the earth, and the length of day and night is equal all over the world. After the autumnal equinox, the direct point of the sun continued to move from the equator to the southern hemisphere, and the days in the northern hemisphere began to shorten and the nights became longer, that is, the days in a day began to be shorter than the nights; The southern hemisphere is the opposite. Therefore, the autumnal equinox is also called the landing point.

At the North Pole and South Pole, on the day of the autumn equinox, the sun is on the horizon all day. After that, as the direct point of the sun continued to move southward, a six-month polar night began near the North Pole, which gradually expanded and then narrowed. A six-month polar day began near the South Pole, which gradually expanded and then narrowed.

During the autumnal equinox, the Yangtze River basin and its vast areas to the north have entered the autumn in the sense of average temperature, and the daily average temperature has dropped below 22℃. At this time, the temperature in the southern region generally drops and tends to be cool. After the autumnal equinox, the cold air mass in the north began to have some influence. The rainy season has just ended in most areas, with a cool breeze blowing gently. Autumn is crisp and the sky is high and the clouds are light. In addition, the autumnal equinox is also an important solar term in agricultural production.