Is the Autumnal Equinox the Beginning of Autumn? Are the days and nights the same length on the autumnal equinox?

Is the Autumnal Equinox the Beginning of Autumn? Are the days and nights the same length on the autumnal equinox?
The Autumnal Equinox is coming. Do you want to know more details? Autumn is the season of harvest. As the eighth month of the lunar calendar arrives, the autumn atmosphere gradually becomes stronger. In such a beautiful season, Shuimoxiansheng.com will accompany you through every day of the eighth lunar month of 2021.

Is the Autumnal Equinox the Beginning of Autumn?

The Autumnal Equinox is not the Beginning of Autumn. The Autumnal Equinox and the Beginning of Autumn are two different solar terms.
Beginning of Autumn:
Beginning of Autumn is the thirteenth solar term in the twenty-four solar terms and the first solar term in autumn. The Big Dipper points to the southwest; the sun reaches 135° of the ecliptic longitude; the solar term falls on August 7-9 of the Gregorian calendar every year.
The Beginning of Autumn represents the beginning of autumn. It is the node when the Yang energy gradually recedes and the Yin energy gradually grows, and the yang-dominant state gradually turns into the yin-dominant state. The beginning of autumn also means that precipitation, humidity, etc. are at a turning point in the year and tend to decline or decrease; in nature, all things begin to move from lush growth to bleak maturity.
Autumnal Equinox:
Autumnal Equinox is the sixteenth solar term of the twenty-four solar terms and the fourth solar term of autumn. The Big Dipper points to Ji; the sun reaches 180° of the ecliptic longitude; the solar term falls on September 22-24 of the Gregorian calendar every year.
Autumnal Equinox, "fen" means "equal" or "half". In addition to referring to the equal length of day and night, it also means that it divides the autumn season equally. After the autumnal equinox, the position of direct sunlight moves southward, the days become shorter and the nights longer in the northern hemisphere, the temperature difference between day and night increases, and the temperature drops day by day.

Are the days and nights the same length on the autumnal equinox?

On the autumnal equinox, the day and night are equal in length.
On the day of the autumnal equinox, the point of direct sunlight reaches 180° of ecliptic longitude (the autumnal equinox), almost directly hitting the Earth's equator, and the day and night are of equal length everywhere in the world (without considering the refraction of sunlight by the atmosphere and the twilight shadows).
After the autumnal equinox, the sun's direct point continues to move from the equator to the southern hemisphere, and the days begin to become shorter and the nights longer in all parts of the northern hemisphere, that is, the day begins to be shorter than the night within a day; the opposite is true in the southern hemisphere. Therefore, the autumnal equinox is also called the autumnal equinox. At the North and South Poles, on the day of the autumnal equinox, the sun stays above the horizon all day.

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