The bridge is a real sundial as can be seen from these next pictures.
This is the shadow crossing the time mark.
This shows the time. If you look closely, you will see that this picture was taken at what would have been 12:45 on June 21. The time varies from day to day due to the changes in the earth's axis as it rotates around the sun.
For more about the bridge, go to the following url: http://www.turtlebay.org/sundial/sundial.shtml
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