The solar term of sterling silver harvest is

The solar term of pure silver harvest is the autumnal equinox. The autumnal equinox is a festival celebrated by people all over the world. Among the Han people and most ethnic minorities in China, it is the tenth day of the tenth lunar month.

The autumnal equinox is one of the twenty-four solar terms of the lunar calendar, which means that it officially enters autumn, usually on September 23rd or 24th every year. The climate in the south began to decline from this solar term. First, on this day, the sun reached the longitude of the Yellow River 180 degrees, hitting the equator of the earth directly. So day and night are divided equally for 24 hours, each with 12 hours. There is no extreme day and night phenomenon in the world. After the autumnal equinox, the polar night range near the North Pole and the polar sun range near the South Pole gradually expanded.