What revered 15h century Korean scientist was the inventor of the world's first rain gage and has an asteroid named after him?

The "cheugugi" was invented by Jang Young-Sil as the first rain gauge in the world. The 15th-century inventor also created an astronomical clock, a celestial globe, a hemispherical sundial, an observatory, and an automatic water clock. He seems outta this world – no wonder a celestial body was named after him.

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