Cheomseongdae Observatory – Is the oldest existing astronomical observatory in Asia


Cheomseongdae Observatory @ KTO

Cheomseongdae Observatory @ KTO

Cheomseongdae is the oldest existing astronomical observatory in Asia. Constructed during the reign of Queen Seon-deok (632-647), it was used for observing the stars in order to forecast the weather. This stone structure is a beautiful combination of straight lines and curves, and was designated as National Treasure No.31 on December 20th, 1962.

Cheomseongdae was built in a cylinder shape with stones 30cm in diameter. 362 stones were piled up to make 27 levels. Roughly 4.16m up from the bottom there is a 1㎡ square entrance and a space to hang a ladder under it. The pavilion stone is believed to have been used as a standard of deciding directions, north, south, east and west. The 362 stones used to build Cheomseongdae represented the 362 days in a lunar year.