Dear Frank, You say:
I have not come across an altitude dial resembling an analemmatic dial in that the gnomon is moved with the seasons and the time curve is a single ellipse. One interpretation of what you seek is to have a dial on a vertical wall where the gnomon is horizontal (and perpendicular to the wall) and moved to the right place according to the solar declination. I have put one such design in: http://www.cl.cam.ac.uk/users/fhk1/PEMB.pdf This is for the latitude of Cambridge and is for a wall which declines about 21 degrees to the east. I suspect that this is what you want. The key thing to note is that the axes of the ellipse are not vertical and horizontal unless the wall faces due south. All the best Frank Frank H King Cambridge UK --------------------------------------------------- https://lists.uni-koeln.de/mailman/listinfo/sundial
