The Prague astronomical clock, installed in 1410. It is the world's oldest astronomical clock still in operation.
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The movement of this clock is the same as the movement of the universe when the Kaaba is the center of the universe
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I just watched this yesterday. The first known astrological clock. (as you might imagine.. Not in operation, but some good detective work, there are functional models of it)
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Prague is great. There is an alchemical laboratory replete with secret tunnels! Amazing!
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