When is the vernal equinox? What does this mean?

The Gregorian calendar date is around March 21(20th to 22nd) every year. The vernal equinox is one of the twenty-four solar terms and the midpoint of ninety days in spring.

Astronomical phenomena

In terms of time period, it means that the sun is located in the interval from 0 to 15, which is about March 20 to April 4 of the Gregorian calendar. But it usually refers to the day (or moment) when the sun hits the equator directly. Simply put, the sun shines directly on the equator, and the day is as long as the night, which is the equinox of day and night. The sun began to move towards the Tropic of Cancer.

phenology,bioclimatology

Spring starts from beginning of spring solar terms to Tomb-Sweeping Day Qi, which is the budding period of plant growth, and the human blood is also in a vigorous period, and the hormone level is also at a relative peak. Here comes the mysterious bird: Ye Yan, the mysterious bird, coaxed, "The vernal equinox has come and the autumn equinox has gone."

Holidays; holiday

The vernal equinox is a national holiday in Japan and is called "the day of vernal equinox". In the Iranian calendar, the vernal equinox is the beginning of a new year, which is called Nowruz Festival. Many ethnic groups in Persia, Kurdish, Turkey, Central Asia, those who were once ruled by the Ottoman Empire, and Zoroastrianism all regard this as a major festival with religious significance.