> >Just as you could use a sphere on the shadow-casting cable for a nodus, you >might consider a sphere at the top of the post gnomon. I suspect one can >estimate the exact center of a sphere's shadow more easily than the precise >location of a very sharp point's shadow. > >Cheers, > >Mac
Maybe someday the archeologists will dig up huge stone spheres that have a mysterious pyramidal concave square hole carved into the bottom, alowing them to be fitted to the top of an egyptian obelisk. The missing nodus! John C>
