What season is spring in Shuang Yi?

The double spring year means that there are two solar terms in beginning of spring in a year. The double spring year is a unique phenomenon in China's commemorative calendar, which is actually caused by the "error between the solar calendar and the lunar calendar" Double spring years generally appear in leap month years. According to the normal month, the lunar calendar has 24 solar terms in a year, and after the 24 solar terms are replaced, it will enter the next year's solar terms replacement. However, due to the leap month, next year's beginning of spring solar terms will appear on this year's tail. Therefore, the phenomenon of "double spring year" appeared. In fact, this is caused by the current custom system in China that the first day of the new year is the beginning of the new year. In ancient times, people regarded beginning of spring as the beginning of a new year, so there was no such thing as a "double spring year" in ancient times. The "double spring year" is only the result of the "correction" of the yin and yang calendars, and it is a natural product of the solar terms in the calendar, which has nothing to do with good or bad luck.