At 11:14 AM 12/29/2007, Dave Guimont wrote: >>>A vertical rod about 4' long (plumb it, or use a level) will have the >>>shortest shadow at noon. > >I should have said "near noon"..... You still need to know "when near noon" to within 5 minutes to get the required accuracy. :) 73 de VK3JED http://vkradio.com