Constructed between 632 and 646 AD Chomsongdae is one of theChomsongdae  world's oldest observatories. It's also one of the most fascinating - there are 30 layers from top to bottom, one for each day of the month. The 12 base stones are for the 12 months of the year and the whole bottle-shaped observatory was constructed of 366 stones, one for each day of the year (or so they thought . . .). Other details of the structure reveal the designer's knowledge of astronomy, geometry and the stars.

9 a.m. to 6 p.m.
9 a.m. to 5 p.m. (November through February)
On foot: 10-15 minutes from Kyongju Station, Anapchi Pond and the National Museum, five minutes from Tumuli Park.
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