There was a tower to observe stars in the 7th century in Silla kingdom [1]. It called 'Cheom Seong Dae' meaning a place to watch stars.첨성대(瞻, cheom)(星, seong)(臺, Dae)to observeStarsplace This is the oldest surviving astronomical observatory in Asia [2].Although it has been through several earthquakes, wars, and storms since its construction, it still maintains its shape without any repairs. h..