What is the specific time of the Spring Equinox in 2021 and what does the word "equinox" mean?

The Spring Equinox is the fourth solar term in spring, which falls in the middle of spring. How good is the Spring Equinox in 2021? A new month will bring new fortunes. With the arrival of the second month of the lunar calendar in 2021, we should not forget to check the almanac content of the day. The relevant articles on Shui Mo Xiansheng website will reveal the secrets to you one by one!

When is the Spring Equinox in 2021?

What does the word "equinox" in the Spring Equinox mean?

The "fen" in Spring Equinox means equal division, referring to the fact that the day and night on the Spring Equinox are equal, each lasting 12 hours.
Around March 20th of the Gregorian calendar every year, when the sun is at 0° of ecliptic longitude (the vernal equinox), it is the vernal equinox. On this day, the sun shines almost directly on the Earth's equator, and the day and night are almost equal in length everywhere in the world (the refraction of sunlight by the atmosphere and the morning and evening shadows are not taken into account here). After the vernal equinox, the sun's point continues to move from the equator to the northern hemisphere, and the days begin to become longer and the nights shorter in all parts of the northern hemisphere, that is, the day is longer than the night; the days begin to become shorter and the nights shorter in all parts of the southern hemisphere, that is, the day is shorter than the night. Therefore, the Spring Equinox is also called the Shengfen.
On the day of the spring equinox, the sun shines directly on the earth's equator. The seasons in the northern and southern hemispheres are opposite. In the northern hemisphere, it is the spring equinox, and in the southern hemisphere, it is the autumnal equinox. At the North and South Poles, on the day of the vernal equinox, the sun stays above the horizon all day. After that, as the sun's direct point continues to move northward, a six-month polar day begins near the North Pole and gradually expands in range; a six-month polar night begins near the South Pole and gradually expands in range.

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