What is the symmetrical autumnal equinox date on March 22nd?
The autumnal equinox, the sixteenth solar term in the twenty-four solar terms of the lunar calendar, usually falls from September 22nd to 24th in the Gregorian calendar every year. The climate in the south began to decline from this solar term. First, the sun arrived at 180 (autumnal equinox) on this day, and the sun almost directly hit the equator of the earth, and the length of day and night is equal all over the world (regardless of the refraction of sunlight by the atmosphere and the shadow in the morning). After the autumnal equinox, the direct point of the sun continues to move from the equator to the southern hemisphere. The northern hemisphere has short days and long nights (short days and short nights), while the southern hemisphere has long days and short nights (long days and short nights). Therefore, the autumnal equinox is also called the landing point.