From ancient observatory, which covers an area of 10,000 m², has survived only its astronomical playground, which is located on a stone platform height of 15 m and represents a square of 40 by 40 m. This stone platform is a preserved part of the fortress wall time of the Ming Dynasty, which then surrounded the city. On the platform are bronze astronomical instruments: an armillary sphere sundial quadrant, a theodolite, a sextant, celestial globe. Tools of the observatory was created in 1442 during the Ming Dynasty and the Qing Dynasty improved.
And although this area, quite small, I think that if you have the time, during your visit to Beijing, you have to see these tools.
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