What does the autumnal equinox mean?

1, the autumnal equinox is the fourth solar term in autumn and 16 of the 24 solar terms. The autumnal equinox is when the sun reaches 180 degrees on September 23rd or 24th every year. The sun shines directly on the equator of the earth, and the day and night are equally divided, each with 12 hours. There is no extreme day and night in the world. After the autumnal equinox, the direct point of the sun continues to move southward, so the autumnal equinox is also called declination. After that, the temperature difference between day and night will gradually increase, and the range will be higher than 10℃.

2. The autumnal equinox season is similar to Tomb-Sweeping Day in some folk customs, and there is also the habit of sweeping graves to worship ancestors, which is called "Autumn Festival". At the autumnal equinox, many people still eat a kind of wild vegetable called "wild amaranth", which some villagers call "autumn Artemisia". In some areas, farmers send photos of autumn cattle door to door. The Autumn Cattle Map is called "Autumn Cattle Map", which prints the solar terms of the lunar calendar on red paper or yellow paper, and also prints farmers' ploughing patterns.