It is 718am local time here in Redding CA and I am sitting here looking up at the Sundial Bridge.
This was before I walked across it.
The bridge spans the Sacramento River.
The gnomon (I think that’s Latin for “pointy-thing”) casts a shadow which can then be used to tell you what time it is.
Those markers are in 15 minute increments along the shadowy path of the gnomon (about 5 1/2 paces apart). You can see three of them in the next photo (only whole hours are on raised platforms).
This is my view as I am uploading this post.