Zhang Heng (78–139 AD) was a prominent Chinese polymath during the Eastern Han Dynasty, known for his contributions to the fields of astronomy, mathematics, engineering, and literature. He is particularly famous for several achievements: 1. **Seismology**: Zhang Heng invented the first known seismoscope, called the "Houfeng Didong Yi," around 132 AD. This device could detect the direction of an earthquake and was significant in the study of seismic activity.
The Center for Strategic and International Studies (CSIS) is a bipartisan, nonprofit policy research organization based in Washington, D.C. Its mission is to provide strategic insights and policy solutions to decision-makers in government, academia, and the private sector. CSIS focuses on addressing the most pressing challenges facing the world, including international security, economic policy, and global health.
Chang Heng is a lunar impact crater located on the far side of the Moon. It is situated in an area characterized by several large impact features and craters. The crater is named after Chang Heng, an ancient Chinese astronomer known for his contributions to the study of celestial bodies. The diameter of Chang Heng is approximately 80 kilometers (about 50 miles).
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