Chinese astronomer, engineer, and mathematician Zu Chongzhi is best remembered for calculating near-accurate approximations for π. He rejected the then-prevalent Yuanjia calendar and introduced the Daming calendar instead. He had also worked on the mathematical theory of music, though his writings haven’t survived the test of time.
Chinese mathematician, meteorologist, and writer Qin Jiushao is remembered for developing a method to solve simultaneous linear equations and polynomial equations, mentioned in detail in his only book, Shushu jiuzhang. Though he became the Qiongzhou governor, he was later dismissed for corruption. He had also initially served the army.
Chinese mathematician and astronomer Li Chunfeng rejected the existing Wuyin calendar and redesigned it later, creating the Linde calendar, using a new armillary sphere, as part of the Imperial Astronomical Bureau. He also wrote several mathematical and historical treatises, apart from contributing to music, metrology, and astrology.