Here is a link to a great circle mapper. You can put in coordinates and = generate a world map with your location and concentric cirles at any = desired distance. I have done mine for each 10 degrees out to the = shadow zone and then again from the far side of shadow zone. I just set = this image as wallpaper for my desktop for quick reference. http://gc.kls2.com/ RandyHere is a link to a great circle = mapper. You=20 can put in coordinates and generate a world map with your location and=20 concentric cirles at any desired distance. I have done mine for = each 10=20 degrees out to the shadow zone and then again from the far side of = shadow=20 zone. I just set this image as wallpaper for my desktop for = quick=20 reference.Randy