The Han Dynasty was very advanced in science. Scientists were well aware of the existence of other planets and the causes of natural disasters. They were even able to calculate the different times of a planets orbit with 99 percent accuracy and that the sun was the reason of the moon’s light. They were not right about everything, like the incorrect assumption of the planets placement around the sun, but they way ahead of their time. In 132 AD an earthquake detector was made by a man named Zang Heng. It was a huge bronze container with eight dragons wrapped around in different directions. The dragons each had a bronze ball in its mouth with a toad underneath it. The toads mouths were open ready to catch the balls. There was a stick in the bronze container that dropped if rattled by an earthquake. Once the stick dropped it would hit a dragon in the direction of the earthquake causing the it to open its mouth and drop a ball into the mouth of the toad. The invention of the seismoscope (earthquake detector) was only one of the many great inventions invented in the Han Dynasty.
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