In the history of ancient Chinese science, there was an outstanding scholar who not only made remarkable achievements in astronomy, mathematics and other fields, but also invented two instruments with profound influence - the armillary sphere and the seismoscope. He was Zhang Heng in the Eastern Han Dynasty.

Zhang Heng, styled Pingzi, was a famous astronomer, mathematician, geographer, poet, and inventor in the Eastern Han Dynasty of China. His life was filled with the exploration of knowledge and love for science, leaving valuable treasures for future generations.

In the field of astronomy, Zhang Heng proposed the "huntian theory", which is one of the important theories of ancient Chinese astronomy. He believed that the universe is a whole and the celestial bodies are constantly rotating. To prove his theory, he invented the armillary sphere. The armillary sphere is an instrument that simulates the motion of celestial bodies and can visually display the motion state of celestial bodies. This invention had a profound impact on later astronomical research.

In the field of seismology, Zhang Heng invented the world's first seismic detection instrument - the seismoscope. The invention of the seismoscope stemmed from Zhang Heng's concern about earthquakes. At that time, earthquakes brought huge disasters to people's lives. After years of research, Zhang Heng finally invented the seismoscope. The seismoscope consists of eight dragon-shaped tubes, and the tails of the tubes are connected to triggers. When an earthquake occurs, the trigger is activated, and a copper ball falls from the dragon's mouth, making a sound to alert people. This invention enabled people to promptly understand the occurrence of earthquakes, which is of great significance for disaster prevention and reduction.

In addition to the armillary sphere and the seismoscope, Zhang Heng also made high achievements in mathematics, geography and other fields. His work "On the Theory of Counting Nets" is an important work in the history of Chinese mathematics and has had a positive impact on later mathematical research. In geography, he drew a Chinese map named "Topographic Map", providing valuable information for later geographical research.

Zhang Heng's life was filled with the exploration and love of science. His inventions and achievements not only had a huge impact at that time, but also had profound significance for scientific research in later generations. His story tells us that only by continuously exploring and being brave in innovation can we achieve remarkable achievements.

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