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![InterestingSTEM Avatar](https://lunarcrush.com/gi/w:24/cr:twitter::1659871093513920512.png) Interesting STEM [@InterestingSTEM](/creator/twitter/InterestingSTEM) on x 647.7K followers
Created: 2025-07-20 19:12:39 UTC

The Prague Astronomical Clock, known as the Orloj, is a medieval clock located on the Old Town Hall in Prague, Czech Republic. Dating back to 1410, it ranks as the third-oldest astronomical clock globally and the oldest still in operation.

![](https://pbs.twimg.com/media/GwUs5dVXIAUh85f.jpg)

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**Related Topics**
[prague](/topic/prague)

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