Why is the repeated date of 12 in the annual calendar wrong?

The result of leap year and leap month is a natural law. This is the calendar, which is what people call the "yellow calendar method". Solar terms and festivals are the inheritance of the unique cultural crystallization of the Chinese nation and the intangible cultural heritage of the Chinese nation. In ancient China, farming was the mainstay. The sun rose at sunrise and returned at sunset, so the 24 solar terms were the product of agricultural economy and culture. Meteorology invented by the ancients is one of the important contents of folk culture and is unique in the world. Festival solar terms belong to a kind of cultural symbol, which has continued from Shang Dynasty to the present.