Zhang Heng

Zhang Heng was born into a gentry family in Nanyang, during the Eastern Han Dynasty.

Zhang Heng starts his formal education, learning Confucian classics, mathematics, and astronomy.

Zhang Heng travels to the capital, Luoyang, to study at the Imperial University, where he excels in various subjects.

Zhang Heng is appointed as a court astronomer, where he begins his work on celestial observations and calendar reform.

Zhang Heng publishes his first mathematical treatise, which includes his work on the calculation of pi and geometric problems.

Zhang Heng invents a water-powered armillary sphere, an advanced astronomical instrument for demonstrating the movements of celestial bodies.

Zhang Heng is promoted to Chief Astronomer, overseeing the imperial observatory and leading astronomical research.

Zhang Heng publishes his groundbreaking work on seismology, including the design of the first seismoscope to detect earthquakes.

Zhang Heng is appointed to the Imperial Secretariat, where he advises the emperor on state affairs and scientific matters.

Zhang Heng plays a crucial role in the reform of the Chinese calendar, improving its accuracy and reliability.

Zhang Heng retires from his official duties in the imperial court, dedicating more time to his scientific and literary pursuits.

Zhang Heng writes several literary works, including poetry and essays, showcasing his versatility as a polymath.

Zhang Heng continues his astronomical observations and records, further refining his understanding of celestial phenomena.

Zhang Heng dies in Nanyang, leaving behind a legacy of significant contributions to astronomy, mathematics, and engineering.