Introduction to the times of the 2021 Spring Equinox, Summer Solstice, Autumnal Equinox and Winter Solstice. Are the times fixed?

Introduction to the times of the 2021 Spring Equinox, Summer Solstice, Autumnal Equinox and Winter Solstice. Are the times fixed?
The 24 solar terms are a product of China. So, let’s take a look at the times of the vernal equinox, summer solstice, autumnal equinox and winter solstice in 2021. Are the times fixed? "The rain from the apricot blossoms wets my clothes, while the wind from the willows blows on my face without making me feel cold." The second month of the lunar calendar in 2021 is a month worth looking forward to. May we all have good fortunes. Check out the latest article on Mr. Shui Mo's website for details!

Introduction to the dates of the spring equinox, summer solstice, autumn equinox and winter solstice in 2021

The time of the Spring Equinox in 2021 is: Saturday, March 20, 2021 17:37:19
The time of the 2021 Summer Solstice is: Monday, June 21, 2021 at 11:32:00
The time of the Autumnal Equinox in 2021 is: Thursday, September 23, 2021 3:20:55
The time of the 2021 Winter Solstice is: Tuesday, December 21, 2021 23:59:09

Are the times of the vernal equinox, summer solstice, autumnal equinox and winter solstice fixed?

No, the times in the 24 solar terms are not fixed.
The time of the Spring Equinox is: Spring Equinox, one of the 24 solar terms, is the fourth solar term in spring. When the Dipper points to Ren, the Sun's ecliptic longitude reaches 0°, and the solar term falls on March 19-22 of the Gregorian calendar every year.
The time of the Summer Solstice solar term is: Summer Solstice, also known as Summer Festival, Summer Solstice Festival, etc., is the 10th solar term of the 24 solar terms. The Big Dipper points to noon; the sun's ecliptic longitude is 90°; the solar term falls on June 21-22 of the Gregorian calendar.
The time of the Autumnal Equinox is: Autumnal Equinox, which is the sixteenth solar term of the twenty-four solar terms and the fourth solar term in 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.
The time of the Winter Solstice is: The Winter Solstice is the 22nd solar term of the "Twenty-Four Solar Terms", the Big Dipper points to Zi, the sun's ecliptic longitude reaches 270°, and it falls on December 21-23 of the Gregorian calendar every year.

How are the 24 solar terms divided?

The first category reflects the seasons. Among them, the Beginning of Spring, the Beginning of Summer, the Beginning of Autumn, the Beginning of Winter, the Vernal Equinox, the Autumnal Equinox, the Summer Solstice and the Winter Solstice are used to reflect the seasons, dividing the year into four seasons: spring, summer, autumn and winter. The vernal equinox, autumnal equinox, summer solstice, and winter solstice are divided from an astronomical perspective, reflecting the turning points of the change in the sun's altitude. The Beginning of Spring, Beginning of Summer, Beginning of Autumn and Beginning of Winter reflect the beginning of the four seasons.
The second category reflects climate characteristics. The five solar terms, namely, Lesser Heat, Greater Heat, End of Heat, Lesser Cold and Greater Cold, reflect the changes in temperature and are used to indicate the degree of cold or hot in different periods of the year; the four solar terms, namely, Rain Water, Grain Rain, Light Snow and Heavy Snow, reflect the precipitation phenomenon and indicate the timing and intensity of rain and snowfall.
The third category reflects phenological phenomena. Grain in Ear and Grain in Ear reflect the maturity and harvest of related crops; Jingzhe and Qingming reflect natural phenological phenomena, especially Jingzhe, which uses the first thunder in the sky and the revival of hibernating insects underground to inform all things in heaven and earth that spring has returned.

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