Cheomseongdae Observatory

첨성대

Gyeongju Cheomseongdae Observatory, built during the reign of Queen Seondeok of Silla (reigned 632-647), is the oldest astronomical observatory in East Asia. It is a representative historical site of Gyeongju and Korea’s National Treasure No. 31.

Cheomseongdae is a cylindrical stone structure approximately 9 meters high. Its 27-tier structure, composed of 362 to 365 stones (representing the days of the lunar or solar year), symbolizes Queen Seondeok, the 27th monarch of Silla, and the lunar calendar. Inside, square windows and observation devices were used by ancient people to observe the stars and predict seasons and agricultural periods.

In ancient times, astronomical observations played a crucial role in agriculture and the nation’s fortunes. Cheomseongdae is a symbolic relic that epitomizes Silla’s scientific and technological prowess and Queen Seondeok’s ruling power. It is known to have influenced the architecture of Japan’s Sensei-dai and China’s Zhougong Observatory.

Visitors can freely view Cheomseongdae Observatory in a park decorated with seasonal flowers and plants. It is located at 839-1 Inwang-dong, Gyeongju-si. Accessible entrance and parking are available, with free and paid parking available. Children are recommended. Operating hours are 9:00 AM to 10:00 PM daily.

Cheomseongdae is a must-see attraction in Gyeongju, not only for stargazing but also as a symbol of Silla’s cultural and historical status and the scientific leadership of its female rulers.

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