The first calendar system calculated the year according to the sun and the months according to the moon. The further idea of setting the seasons according to the movement of the stars created a harmonious whole which is still observed in China today.
這套歷法，根據太陽運行周期定「年」，根據月亮運行周期定「月」，看星星的流轉定「季」，相當的科學化。它逐漸演變完備，一直延用到四千多年後今天中國人仍習用的「陰曆」。