Hi Allan, On the equinoxes, you can plot the shadow of any point and it will produce an East-West line. A perpendicular would be a N-S line.
Warren Allan Pratt wrote: > Hello, > All dialists know, I'm sure, of the verical-stick, strike and arc, > bisect the angle method of determining a north-south line. > > But is there any other method of doing so which does not require some > additional data, like date, time, or something similar? Or is this the > only known way of doing so without external data? > > Al Pratt
