Dear dialling friends, I have recently noticed an offering on ebay.com of an interesting device, a solar slide rule that should predict the time and azimuth of the sunrise and sunset for a given location. (I actually think that it shouldn`t be called a slide rule, just a nomogram).
I saved a copy of the short description and images at: http://www2.crosswinds.net/~vitplanocka/ebay.htm (the images take a long time to load) Could someone please tell me something about the principle of this device? Thanks Vit Planocka 50N 15E
