1 Shi Shen Astronomy Shi Shen, the first astronomical masterpiece of the Warring States Period-an astronomer of the Warring States Period, Shi Shen's first astronomical masterpiece "Astronomy". After the Western Han Dynasty, people honored Tianwenzhi as the Star Classic of history. The book marks the position of 12 1 star, and also records the movements and eclipses of five planets: water, wood, gold, fire and earth. Shi Shen compiled the earliest catalogue. And called "shaoyang" has realized that he can shine.

2 Liu Zhuo Astronomy Calendar of the Emperor of the Sui Dynasty Liu Zhuo, an astronomer of the Sui Dynasty. He created the emperor's calendar. He first considered the non-uniformity of the movement of the sun and the moon, and founded the quadratic difference interpolation method with equal intervals. Calculate the apparent velocity of the sun and the moon. At the same time, he changed the age difference to 75.

3 A line of astronomy, a line of "Great Yan Li" in the Tang Dynasty-an astronomer in the Tang Dynasty. He compiled a new calendar, Dayan Calendar, including ten calendars, which was very advanced in ancient times. As early as BC13rd century, people in China made a lunar calendar according to the movement of the sun and the moon.

4 Southern Song Dynasty Yang Zhongfu Writer "Unified Calendar" Yang Zhongfu-China Southern Song Dynasty astronomer. He created the "unified calendar", and he determined that the length of the tropic year was 365.2425 days. It is also found that the length of the tropic year has increased and decreased.