Brief introduction of Zhang Sixun

Zhang Sixun was born in Sichuan (now Bazhou District, Bazhong City). Astronomers in the Northern Song Dynasty. Zhang Sixun, a Tian Jian student, was born in Song Taiping for four years (979). He created the water transport "Hunxiang" with mercury (avoiding the influence of temperature change) as the power fluid. "Song Shi Tian" records: "Its system: the building is high, the machine is hidden inside, and you are safe. Under the wheel, under the foot; It is also a horizontal wheel, a side wheel, an inclined wheel, a fixed clearance, a middle clearance, a small clearance and a Tianzhu; Seven straight gods, ring the bell left, buckle the bell right, beat the drum in order to decide the number of engravings. Day and night, cycle after cycle. And take wood as the twelve gods, each straight for a while, and then each holds its own card, circulating out, depending on the number of moments, the length of day and night; There are zenith, Tianya, Tianguan, Tianzhi, Tianbao (Tuo), Tian Shu and Tiantiao, which are 365 degrees. They are the sun, the moon, the five stars, Wei Zi Palace, Lodging, Doulou and the Yellow Equator. " Later, Song Taizong ordered it to be built in the palace, and it was successful in one year. It was placed under the East Drum Tower of the Civilization Hall and named "Taiping Mixed Clothes". It was destroyed in Su Song (1088), and no one knew how to do it.