浑仪

yǐ shuǐ wéi dòng lì jí hún yí hún xiàng bào shí zhuāng zhì yú yī tǐ shì shì jiè shang zuì zǎo de tiān wén zhōng

以水为动力，集浑仪、浑象、报时装置于一体，是世界上最早的天文钟。

Using water power and having all the functions of the armillary sphere, it was the first astronomical clock in the world.