Zhang Heng is a great scientist in the history of our country. He has made outstanding contributions in astronomy (armillary sphere), mathematics (pi 3. 162) and seismology (seismograph), leaving a glorious chapter in the history of world science.

His Fu on Erjing is also a literary masterpiece.

Zu Chongzhi (429 ~ 500)

He is a great scientist in the history of our country. He has made great achievements in figures, machine building, music and law, especially in mathematics. Astronomical calendar is also one of his main research contents, and Daming Calendar is his representative in this respect.

Zhang Sui (a group of monks) (683 ~ 727)

In order to avoid Wu Sansi, the nephew of Wu Zetian, he became a monk. At that time, Emperor Xuanzong of the Tang Dynasty was in charge of astronomical calendar, meteorology, earthquake and other work, and supported the "Huntian Theory".

We made exquisite astronomical instruments, such as ecliptic patrol instrument and water-borne ammunition instrument, and conducted the first large-scale astronomical survey in ancient China. The data obtained were used to compile Dayan Calendar.