Cheomseongdae
Overview
 
Cheomseongdae is an astronomical observatory in Gyeongju
Gyeongju
Gyeongju is a coastal city in the far southeastern corner of North Gyeongsang province in South Korea. It is the second largest city by area in the province after Andong, covering with a population of 269,343 people according to the 2008 census. Gyeongju is southeast of Seoul, and east of the...

, South Korea
South Korea
The Republic of Korea , , is a sovereign state in East Asia, located on the southern portion of the Korean Peninsula. It is neighbored by the People's Republic of China to the west, Japan to the east, North Korea to the north, and the East China Sea and Republic of China to the south...

. Cheomseongdae means star-gazing tower in Korean
Korean language
Korean is the official language of the country Korea, in both South and North. It is also one of the two official languages in the Yanbian Korean Autonomous Prefecture in People's Republic of China. There are about 78 million Korean speakers worldwide. In the 15th century, a national writing...

. Cheomseongdae is the oldest surviving observatory in East Asia
East Asia
East Asia or Eastern Asia is a subregion of Asia that can be defined in either geographical or cultural terms...

, and one of the oldest scientific installations on Earth. It dates to the 7th century to the time of kingdom of Silla
Silla
Silla was one of the Three Kingdoms of Korea, and one of the longest sustained dynasties in...

, which had its capital in Gyeongju. Cheomseongdae was designated as the country's 31st national treasure on December 20, 1962.
According to Samguk Yusa
Samguk Yusa
Samguk Yusa, or Memorabilia of the Three Kingdoms, is a collection of legends, folktales, and historical accounts relating to the Three Kingdoms of Korea , as well as to other periods and states before, during, and after the Three Kingdoms period.The text was written in Classical Chinese, which was...

, Cheomseongdae was constructed under the reign of Queen Seondeok
Queen Seondeok of Silla
Queen Seondeok of Silla reigned as Queen of Silla, one of the Three Kingdoms of Korea, from 632 to 647. She was Silla's twenty-seventh ruler, and its first reigning queen...

 (632-647) near the capital of the kingdom.
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