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Cheomseongdae

Stone tower in Gyeongju, South Korea, the oldest surviving astronomical observatory in East Asia, built under Silla's Queen Seondeok (632-647). It stands 9.17 m on a stylobate, a curved cylindrical body and a square top, with a window halfway up; from above it forms the character for 'well'. The body is cut granite, usually counted as 365 blocks for the days of the year, though a 1962 museum survey counted 366, the difference an internal slab. National Treasure no. 31 since 20 December 1962; part of the Gyeongju Historic Areas. Coordinates: Wikipedia = Wikidata 35.8347/129.219 = OSM.

Dated events and their evidence

• 632 CE mainstream
  built during the reign of Queen Seondeok (632-647) source
• 1962 CE mainstream
  National Treasure no. 31, 20 December 1962 source

Where

35.8347° N, 129.2190° E

Sources

• https://en.wikipedia.org/wiki/Cheomseongdae

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