Roger, I too suggested a circular pattern of stones around the periphery of the dial center to act as sighting markers for different (mainly solar) observations (URL of proposal image below). Unfortunately, and I hope you have better luck, the design review process eliminated them, they were thought to be too easy to trip over.
http://www.gcstudio.com/images/parkdial.jpg -Luke <snip> > My proposal for this park on the eastern edge of Calgary is an analemmatic > dial, laid out with stone markers, in the center of a larger elliptical > retaining wall forming a council circle or conversation pit.