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It is thought to be in north China's Shanxi Province, Taosi relics site, dating back to some 4,100 years ago.

The observatory was in the shape of a semicircle 40 meters in diameter in the main observation platform and 60 meters in diameter in the outer circle. It was made by rammed earth in three circles.

13 stone pillars, at least four meters tall, stood on the foundation of the first circle originally, forming 12 gaps between them. The ancient people observed the direction of sunrise through the gaps and distinguished the different seasons of the year.

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