Old city wall and observatory
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![Part of the remains of the old city wall built in Ming Dynasty.](https://a4.pbase.com/u25/towkay/medium/14782691.03OldcitywallandobservatoryP3230062.jpg) P3230062.jpgPart of the remains of the old city wall built in Ming Dynasty. |
![There use to be a railway line running along the wall, and this was the Signalling station.](https://a4.pbase.com/u25/towkay/medium/14782692.03OldcitywallandobservatoryP3230066.jpg) P3230066.jpgThere use to be a railway line running along the wall, and this was the Signalling station. |
![Close up of the walls. There are restoring it using old bricks from old houses.](https://a4.pbase.com/u25/towkay/medium/14782693.03OldcitywallandobservatoryP3230067.jpg) P3230067.jpgClose up of the walls. There are restoring it using old bricks from old houses. |
![Another view of the South-east tower.](https://a4.pbase.com/u25/towkay/medium/14782697.03OldcitywallandobservatoryP3230070.jpg) P3230070.jpgAnother view of the South-east tower. |
![They dug this arch in the wall to let the railway through.](https://a4.pbase.com/u25/towkay/medium/14782698.03OldcitywallandobservatoryP3230071.jpg) P3230071.jpgThey dug this arch in the wall to let the railway through. |
![View from under the South-east tower.](https://a4.pbase.com/u25/towkay/medium/14782699.03OldcitywallandobservatoryP3230072.jpg) P3230072.jpgView from under the South-east tower. |
![The Celestial Globe at the Ancient Observatory.](https://a4.pbase.com/u25/towkay/medium/14782700.03OldcitywallandobservatoryP3230073.jpg) P3230073.jpgThe Celestial Globe at the Ancient Observatory. |
![The Quadrant.](https://a4.pbase.com/u25/towkay/medium/14782701.03OldcitywallandobservatoryP3230074.jpg) P3230074.jpgThe Quadrant. |
![The Ecliptic Armilla.](https://a4.pbase.com/u25/towkay/medium/14782702.03OldcitywallandobservatoryP3230075.jpg) P3230075.jpgThe Ecliptic Armilla. |
![The Equatorial Armilla.](https://a4.pbase.com/u25/towkay/medium/14782704.03OldcitywallandobservatoryP3230079.jpg) P3230079.jpgThe Equatorial Armilla. |
![The Sextant.](https://a4.pbase.com/u25/towkay/medium/14782706.03OldcitywallandobservatoryP3230081.jpg) P3230081.jpgThe Sextant. |
![The Altazimuth.](https://a4.pbase.com/u25/towkay/medium/14782707.03OldcitywallandobservatoryP3230082.jpg) P3230082.jpgThe Altazimuth. |
![The Armillary Sphere.](https://a4.pbase.com/u25/towkay/medium/14782709.03OldcitywallandobservatoryP3230084.jpg) P3230084.jpgThe Armillary Sphere. |
![View of the observation tower.](https://a4.pbase.com/u25/towkay/medium/14782710.03OldcitywallandobservatoryP3230085.jpg) P3230085.jpgView of the observation tower. |
![This sundial is a replica of a similar one in the Forbidden City, with the lost stand restored.](https://a4.pbase.com/u25/towkay/medium/14782711.03OldcitywallandobservatoryP3230086.jpg) P3230086.jpgThis sundial is a replica of a similar one in the Forbidden City, with the lost stand restored. |
![Close up of the Sundial.](https://a4.pbase.com/u25/towkay/medium/14782712.03OldcitywallandobservatoryP3230087.jpg) P3230087.jpgClose up of the Sundial. |
![A device used to measure length of it's shadow. Based on that, the dates and time of the Solstices and Equnioxes can be determined.](https://a4.pbase.com/u25/towkay/medium/14782713.03OldcitywallandobservatoryP3230088.jpg) P3230088.jpgA device used to measure length of it's shadow. Based on that, the dates and time of the Solstices and Equnioxes can be determined. |
![Signage on the tower.](https://a4.pbase.com/u25/towkay/medium/14782714.03OldcitywallandobservatoryP3230089.jpg) P3230089.jpgSignage on the tower. |
![The Abridged Armilla.](https://a4.pbase.com/u25/towkay/medium/14782715.03OldcitywallandobservatoryP3230090.jpg) P3230090.jpgThe Abridged Armilla. |
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