Zhang Heng (Chinese astronomer)

Zhang Heng was a renowned Chinese astronomer, engineer, and inventor from the Eastern Han Dynasty (78–139 AD). He made significant advancements in astronomy, creating one of the earliest seismographs to detect earthquakes and developing improved star maps. His work helped improve understanding of celestial movements and natural phenomena. Zhang Heng also invented various mechanical devices, including water clocks and celestial models, showcasing his innovative spirit. His contributions laid important groundwork for future scientific development in China and globally, demonstrating a combination of observational skill and engineering ingenuity.