<a href="//commons.wikimedia.org/wiki/Cheomseongdae" title="Cheomseongdae">Cheomseongdae</a> is an <a href="//commons.wikimedia.org/w/index.php?title=Astronomical_observatory&amp;action=edit&amp;redlink=1" class="new" title="Astronomical observatory (page does not exist)">astronomical observatory</a> in <a href="//commons.wikimedia.org/wiki/Gyeongju" class="mw-redirect" title="Gyeongju">Gyeongju</a>, South Korea. It is the oldest surviving astronomical observatory in Asia. It was constructed in the 7th century in the kingdom of <a href="//commons.wikimedia.org/wiki/Silla" class="mw-redirect" title="Silla">Silla</a>. Cheomseongdae was designated as the Korea's <a href="//commons.wikimedia.org/w/index.php?title=National_treasures_of_Korea&amp;action=edit&amp;redlink=1" class="new" title="National treasures of Korea (page does not exist)">31st national treasure</a> on December 20, 1962. Modeled on <a href="//commons.wikimedia.org/w/index.php?title=Baekje&amp;action=edit&amp;redlink=1" class="new" title="Baekje (page does not exist)">Baekje</a>'s Jeomseongdae, which now exists only in historical records, Cheomseongdae influenced the construction of a Japanese observatory in 675, and Duke Zhou's observatory in China in 723.
<a rel="nofollow" class="external text" href="https://www.flickr.com/people/98502473@N00">Matt and Nayoung Wilson</a> from Atlanta and surrounding, US
CC BY 2.0
<p><a rel="nofollow" class="external text" href="https://www.flickr.com/photos/98502473@N00/2601226034/">S1050317</a>
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<ul><li>Uploaded by <a href="//commons.wikimedia.org/wiki/User:Caspian_blue" title="User:Caspian blue">Caspian blue</a></li></ul>