Zhang Heng died in Luoyang in 139 AD. He was 61 years old when he died.
He was born in 78 AD in China. His family is one of the renown ones. It was in the Han Dynasty.
Zhang Heng was a famous astronomer and mathematician. He was also an inventor. He had some great invention that helped human. One of his most famous works is the thing that can detect earthquakes.
Zhang Heng invented the first seismograph and also remade the calender so that the seasons were aligned.
He was born in Luoyang, China.