The "spring equinox" means half, which is divided into two, the day and night are equally divided, and the cold and heat are balanced. In addition, the vernal equinox also means the equal division of spring. Traditionally, spring is from the beginning of spring to the beginning of summer, and the vernal equinox is in the middle of the three months of spring.  Therefore, in ancient times, the vernal equinox was also known as "the middle of the day", "the equinox of day and night" and "the moon of mid-spring". On the vernal equinox, the sun shines directly on the Earth's equator, and day and night are equal in length.
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