being an astronomer, in Beijing, I have not miss the visit the ancient Observatory https://en.wikipedia.org/wiki/Beijing_Ancient_Observatory . Various astronomical precision instruments populate the garden and the elevated terrace, see the images. My presence in some of them give an idea of their dimensions. Special guest of the Observatory is certainly the star dial for measuring the time during the night https://en.wikipedia.org/wiki/Nocturnal_%28instrument%29 .
Salutations
Giancarlo
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