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The vernal equinox is the fourth of the twenty-four solar terms and the midpoint of the ninety days of spring. Douzhimao, the yellow longitude of the sun reaches 0°, and it meets on March 19-22 in the Gregorian calendar every year. The vernal equinox is of great significance in astronomy. On the day of the vernal equinox, the sun shines directly on the equator, and the day and night are equally divided in the northern and southern hemispheres. The vernal equinox climate is characterized by warm and sunny weather. …
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