Which solar term begins to lengthen one day, and which solar term begins to lengthen one day?

1. After the vernal equinox, the days in the northern hemisphere began to get longer. "The vernal equinox, Yin and Yang. So it's hot and cold day and night. " It means that the vernal equinox is a solar term, and day and night are equal in length, so day and night are average, and cold and heat are average.

2. A word "fen" tells the boundary between day and night, cold and heat. At this time, the longitude of the sun is 0 degrees and the position of the sun is above the equator. According to the lunar calendar, "it refers to the vernal equinox, which is about Sunday. The northern and southern hemispheres are equally divided day and night, which is also half of spring, so it is called the vernal equinox."