The Chinese calendar has a very early genesis. When there have been the primitive agriculture and pasture, there was the primitive calendar. From the end of the Zhou dynasty to the beginning of the Han dynasty, the written calendar, "the ancient quartered calendar", was improved and ameliorated through repeated reform and struggle.
It reached a comparatively high scientific level and made one after another achievement. In ancient times, the Chinese people mostly used the traditional lunar and solar calendar. But it included not only the arrangement of the year, the month, the day and the hour, but also the calculation of the position of the sun, the moon and the five stars (Venus, Jupiter, Mercury, Mars and Saturn), the forecast of the solar eclipse and lunar eclipse, the arrangement of the solar term etc. The reform of the calendar brought forward new theories measured the accurate astrological data and improved the calculation method. The achievements of the ancient Chinese calendar dominate the astronomical history of world.
The twenty-four solar term was created originally by the Chinese people, from which we can see the high achievement in agriculture and science in ancient China. The data employed in the ancient Chinese calendar were all sophisticated. All in all, the ancient China has made great achievements in calendar.