Seoul Observatory (Gwanseonggam)

The Gwancheondae observatory in Seoul is a historical site where stars were observed during the Joseon Dynasty. It was built on the site of the Gwanseonggam, a meteorological and astronomical observatory of the Joseon period. It is also known as Cheomseongdae, which means "star-observing platform," as it features a raised platform called "Sogandeok." Established in the 16th year of King Sejong's reign (1434), it served as the observation platform for the Seoun Observatory, which was responsible for astronomy, geography, meteorology, and water clocks. Along with the Cheomseongdae of the Silla Dynasty in Gyeongju, the Mangwoldae observatory of the Goryeo Dynasty in Kaesong, and the Gwancheondae within the Changgyeonggung Palace in Seoul, it is a valuable resource for studying the development of Korea's astronomical observation history.

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